NEED HELP with MATH CALCULATIONS 
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Stephen Se in Charlton, Massachusetts 51 months ago 
This is a dilution problem, (Q1*C1 = Qf*Cf). Let's convert the measurements to friendly appearances: 0.5 L = 500 mL, 1:5000 = 0.02%, 1:1000 = 0.10%; Q1*(0.10%) = (500 mL)*(0.02%), Q1 = 100 mL; Qf = Qh2o + Q1, (500 mL) = Qh2o + (100 mL), Qh2o = 400 mL. You need 100 milliliters of the stock solution with 400 milliliters of sterile water to make half a liter of 0.02% epinephrine solution. 
Stephen Se in Charlton, Massachusetts 51 months ago 
keshia in Richmond, Virginia said: Plz help with solving this problem: Flow Rate = (total volume per hour)*(administration set)*(unit conversion to minutes), F.R.=(1,000mL/12hr)*(16gtts/1mL)*(1hr/60min)=22.2gtts/mL, 23 drops per minute 
Stephen Se in Charlton, Massachusetts 51 months ago 
Jayb1 in Merced, California said: How many grams of 1 hydrocortisone cream should be mixed with 30g of 2.5% hydrocortisone cream to make 2% hydrocortisone cream This is a mixture problem which can also be solved using alligation. Let's solve it first by using the mixture formula, m1*c1+m2*c2=mf*cf with mf=m1+m2, m1*(1.0%)+(30g)*(2.5%)=mf*(2.0%), mf=m1+(30g). We have two equations and two unknowns. Removing all the percentages and solving by substitution, m1*1+75g=m1*2+60g, m1=15g, mf=30g+15g=45g. We need 15 grams of the 1.0% hydrocortisone cream. Alligation: 1.0% is the lower strength, 2.5% is the higher strength, 2.0% is the desire strength. Place 2.5% in the upper left hand corner of our alligation grid, 1.0% in the lower left corner and 2.0% in the middle. The difference between the desire and lower is 1 part which goes into the upper right hand corner of the grid. The difference between the desire and higher is 0.5 part which goes in the lower right hand corner of the grid. The total parts for the desire strength is the sum of the higher part and the lower part, 1 and 0.5, respectively. Use proportion to find the weights of the lower strength, 0.5:1::X:30g, X=15g. We need 15g of the 1.0% strength hydrocortisone. 
Stephen Se in Charlton, Massachusetts 51 months ago 
donna in Jonesborough, Tennessee said: I need help with this problem. Use proportion to find the percentage of gentian violet in the 1:10,000 solution. 1:10,000::X:100mL, X=0.01, there are 0.01% of gentian violet in the solution. 100mL of a 0.01% solution is the same as 100mL*(0.01g/100mL) which equals to 0.01g or 10 mg. You need 10 mg of gentian violet to prepare a 100mL solution with concentration ratio of 1:10,000 or a 0.01% percent concentration. 
Stephen Se in Charlton, Massachusetts 51 months ago 
samuel Boucher in Chandler, Arizona said: I am trying to figure this problem. I have to dilute 1g of powder to 330 mg/ml and give a 600 mg dose. I need to know how much diltent to add, how much to withdraw and what size syringe to use. I have never used or do I have a needle to know what size. I can problaby figure out the diluent to add 0.330g:1mL::X:100mL, X=33g, there is 33 grams of the powder in a 330mg/mL concentration. 1g:Y::33g:100mL, Y=3.03mL, you need 3.03 mL of diluent to dissolve the 1 gram powder. (1mL/330mg)*(600mg/dose)=1.8mL per dose, you need to draw out 1.8 milliliters of the diluted solution. 
Stephen Se in Charlton, Massachusetts 51 months ago 
rt in Portofspain, Trinidad and Tobago said: how many grams of yellow mercuric oxide must be added to 30g of 1% yellow mercuric oxide ointment to prepare a 5% ointment. 100% 4
4:95::X:30g, X=1.26g, you need 1.26 grams of yellow mercuric oxide. 
Stephen Se in Charlton, Massachusetts 51 months ago 
Brooke in Gallatin, Missouri said: i need help solving this problem...i dont even know how to set it up..if someone could please explain how i get this answer that would be wonderful..thanks 150mL of 3% is equal to 150mL*(3g/100mL) which is equal to 4.5g, you need 4.5 grams of metronidazole to compound the suspension. 4.5g*(tab/0.5g)=9tab, you need nine 500mg tablets. 
Stephen Se in Charlton, Massachusetts 51 months ago 
koolrvr31 in Wichita, Kansas said: PLEASE HELP Divide the 50gelcaps formula by 5 for 10gelcaps, (0.6:2:0.25)/5 equals 0.12:0.4:0.05, 0.12g of caffeine, 0.4g of aspirin, 0.05g of inerts 
Stephen Se in Charlton, Massachusetts 51 months ago 
koolrvr31 in Wichita, Kansas said: Also, I know this is an aligation problem and thought I understand how to plug the numbers, but its not working out It's not an alligation problem, the ingredients are not similar in type. Caffeine is not the same as aspirin nor is it an inert ingredient. Use alligations when you have the same ingredients but at different strengths. This is a proportional problem. Use proportions to solve ingredients problems containing three or more components in a mixture. 
Stephen Se in Charlton, Massachusetts 51 months ago 
Juan Rodriguez in Tijuana, Mexico said: I have a 20% solution and want to dilute it to 0.02% solution. I need 10mL of 0.02% solution. Q1*C1=Qf*Cf, Q1*(20%)=(10mL)*(0.02%), Q1= 0.01mL, you need 0.01 milliliters of the stock solution. 
Stephen Se in Charlton, Massachusetts 51 months ago 
Linda Thompson in Tyler, Texas said: I really need help solving this problem and show me the formula on how you get the answer 1% of salicyclic acid is equal to 1 gram of salicyclic acid in 100 grams of cream, 1%=(1g/100g). Using proportion, 1g:100g::X:240g, X=2.4g, you need 2.4 grams of salicyclic acid in the 240 gram cream. 
Stephen Se in Charlton, Massachusetts 51 months ago 
DORIS SANTAN in Los Angeles, California said: I NEED HELP PLZ SOMEONE!!! F.R.=(1000mL/24hr)*(60gtts/mL)*(hr/60min)=41.7 gtts/min, you have a flow rate of 42 drops per minute. 
Stephen Se in Charlton, Massachusetts 51 months ago 
DORIS SANTANA in Los Angeles, California said: HOW DO I WORK IN THIS PROBLEM WITH A FRACTION 31.25 gtts/min = 32 drops per minutes 
Stephen Se in Charlton, Massachusetts 51 months ago 
Nohemi contreras in Santa Monica, California said: order: penicillin 400,000 U IM q,3h No, it's 1.6 mL 
Stephen Se in Charlton, Massachusetts 51 months ago 
elizabeth thompson in Sumter, South Carolina said: prepare 220mg of digoxin in using the stock concentration of 80mg/4ml 11mL 
Stephen Se in Charlton, Massachusetts 51 months ago 
sharon in Deerfield Beach, Florida said: A physician ordered 600.000 U penicillin PO q6h. The available drug is 400.000 U per scored tablet. How many tablets you will administer. 1.5 tablet PO q6h 
Stephen Se in Charlton, Massachusetts 51 months ago 
Keri said: if 750 ml of a 2% solutionis diluted by 40% of its volume, what is the new concentration in mg/ml? 14.3 mg/mL 
CG in Saint Charles, Missouri 48 months ago 
I always have problems with calculating how many prednisone to give to a patient. For instance: The patient has a prescription for 10 mg and the doctor starts them off with 40mg QD x2 days; 30mg QD x3 days; 20mg QD x4 days; and 10mg QD x5 days. Please help. Thanks! 
Msz_ladi3 43 months ago 
In school fr CphT need help with this math, not understanding how to get the answer. Please help?
2. Amox 0.25grams/fluid dram 130mg po tid x10 days
Im not understanding how to get the answers its a really fast paced class someone please help? 
Joe Medina, CPhT, BS Pharmacy in Denver, Colorado 43 months ago 
Msz_ladi3 said: In school fr CphT need help with this math, not understanding how to get the answer. Please help? 
pss in Needham Heights, Massachusetts 42 months ago 
DORIS SANTAN in Los Angeles, California said: I NEED HELP PLZ SOMEONE!!! 1,200gtt/min 
kim5 in Hampton, Virginia 41 months ago 
hi im trying to calculate the flow rate for Iv of 0.6L of Lactated ringers solution in 24hrs if the drop factor for tubing is 12gtts/ml. (Hint) Make sure your equation includes conversion factors for volume and time so that the answer is in gtt/min Please help me asap, thanks 
kim5 in Hampton, Virginia 41 months ago 
also, an Iv infusion order is written for 0.3L of D5W/).45% NS to run 12hrs. The drop factor for the Iv is set 12gtt/mL. What is the flow rate in drops per min.(using the same hint) 
kia in San Antonio, Texas 36 months ago 
i need help soliving several problems but ill post them one by one. a 1:10 solution contains____G of active ingredient and ____mL of product and 1000 mL of that solution contains_____G 
kia in San Antonio, Texas 36 months ago 
how many grams of amoxicillin are in the bottle? the label shows 250mg per 5mL at the bottom its shows 150 mL bottle i know 1g=1000mg i can use that to get rid of the mg....but i need to get rid of the Ml 
WilderGhost in Taunton, United Kingdom 16 months ago 
Hey guys
500mg capsules can fit into a bottle of 120 2mg capsules Need help fast Thanks 
JP3 in South Richmond Hill, New York 13 months ago 
Rx calls for hydrocortisone 1% mixed with mupirocin 2% in a 70%/30% combination for a total of 60 grams. What is the % strength of mupirocin in the final product? Answer is 0.6% but can anyone show me the appropriate steps to calculate the answer. Can any pharmacist out there help explain how to answer this question? Thanks in advance. 
Pharmacy Tech Review in Madison, Tennessee 13 months ago 
42 grams of hydrocortisone is used (70% x 60 grams)
2% means there are 2 grams per 100 grams so set up the first equation: 2/100 x X/18 cross multiply this to get 100x =18 x = .36 THEN set up next equation: .36/60 x X/100 cross multiply to get 60x=36 Final answer is x = .6 pharmacytechreview.com helps people study for the PTCE. Feel free to check us out :) 
Pharmacy Tech Review in Madison, Tennessee 13 months ago 
JP3 in South Richmond Hill, New York said: Rx calls for hydrocortisone 1% mixed with mupirocin 2% in a 70%/30% combination for a total of 60 grams. What is the % strength of mupirocin in the final product? 42 grams of hydrocortisone is used (70% x 60 grams)
2% means there are 2 grams per 100 grams so set up the first equation: 2/100 x X/18 cross multiply this to get 100x =18 x = .36 THEN set up next equation: .36/60 x X/100 cross multiply to get 60x=36 Final answer is x = .6 pharmacytechreview.com helps people study for the PTCE. Feel free to check us out :) 
shannagarza69 in Hollister, California 12 months ago 
I have 8% of alcohol solution, how much 8% compound to 1500 ml bottle of 20% solution. What quantity do I report? 
shannagarza69 in Hollister, California 12 months ago 
8% of alcohol solution how much 8% compounded 1500 ml bottle of 20% solution. What quantity will be report? 
shannagarza69 in Hollister, California 12 months ago 
shannagarza69 in Hollister, California said: 8% of alcohol solution how much 8% compounded 1500 ml bottle of 20% solution. What quantity will be report? I figured it out. I did 20% x 1500 ml= 30000 divided by 8 % = 3750 ml 
Laurenn in Virginia Beach, Virginia 11 months ago 
5 gm vial is reconstituted with 100 ml what is the drug concentration? I can not for the life of me remember how to figure this out. 
Henry James in Brooklyn, New York 11 months ago 
Q. The physician orders 60mg of a medication and the medication strength is 1gm/capsule.How many capsules will the patient need and how many will the pharmacy dispense if the patient is to take 60mg 4 times /day for 1m month 
196328 in Jacksonville, Florida 10 months ago 
orders 2.5 mg of Kenolog 10mg/ml injection for a large cyst. How much Kenolog will you draw up? 
Jp3 in Jamaica, New York 9 months ago 
196328 in Jacksonville, Florida said: orders 2.5 mg of Kenolog 10mg/ml injection for a large cyst. How much Kenolog will you draw up? 0.25 mL of Kenolog 2.5 mg/X = 10 mg/mL

pookie5353 in Indiana 9 months ago 
donna in Jonesborough, Tennessee said: How many ml of a 20% solution should be added to 50 ml of a 40% solution to obtain a 25% solution? 37.5? 
pookie5353 in Indiana 9 months ago 
koolrvr31 in Wichita, Kansas said: Also, I know this is an aligation problem and thought I understand how to plug the numbers, but its not working out Not sure if I got the right answers but I have:

pookie5353 in Indiana 9 months ago 
Nohemi contreras in Santa Monica, California said: order: penicillin 400,000 U IM q,3h I have 1.6, don't know if it's right either 
pookie5353 in Indiana 9 months ago 
DORIS SANTANA in Los Angeles, California said: HOW DO I WORK IN THIS PROBLEM WITH A FRACTION 31 
bluehair in Columbus, Georgia 9 months ago 
trying to figure this problem out... how to solve this problem... D/H*Q 0.5grams divided by 7 1/2grains * 1ml any suggestions?? 
Zack King in El Paso, Texas 6 months ago 
20 mL of 8% thiopental solution is drawn up. How many milligrams of drug does this represent?
Please Help Me :( 
J. Wyatt in Virginia Beach, Virginia 6 months ago 
Zack King in El Paso, Texas said: 20 mL of 8% thiopental solution is drawn up. How many milligrams of drug does this represent? The answer is C. 1,600mg. First you convert the 8% to W/V. Anything written as a percentage is over 100. So 8/100 = 0.08*1000 (mg/ml = 1mg/1000ml) is the same as 80mg/ml. 80mg/ml*20ml = 1,600mg/20ml. 
J. Wyatt in Virginia Beach, Virginia 6 months ago 
Apologies mg/ml = 1000mg/100ml. So it's the same thing 8% = 80mg/ml same as 8000mg/100ml. 
pookie5353 in Indiana 6 months ago 
My answer would be C 
Jp3 in Jamaica, New York 6 months ago 
pookie5353 in Indiana said: 31 This is late, but hope it helps anyways. 15 gtt/mL X 1500 mL/12 hrs X 1 hr/60 min = 31.25 gtt/min

Jp3 in Jamaica, New York 6 months ago 
J. Wyatt in Virginia Beach, Virginia said: The answer is C. 1,600mg. First you convert the 8% to W/V. Anything written as a percentage is over 100. So 8/100 = 0.08*1000 (mg/ml = 1mg/1000ml) is the same as 80mg/ml. 80mg/ml*20ml = 1,600mg/20ml. Answer is C. 1600 mg 8% is 8g/100 mL so, 8g/100 mL = X/20 mL solve for X. X is 1.6 g and convert it to 1600 mg by multiplying 1000. OR You can also choose to convert 8% to .08 and multiply it by 20 mL. Answer is 1.6 grams. Convert to milligrams by multiplying by 1000. And you get 1600 mg. 
annie in Christiansburg, Virginia 3 months ago 
i have this problem and i think i just have too much information , so I am having difficulty getting the equation set up'

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