SOLUTION: A cough medicine contains 25% alcohol. How much liquid should a pharmacists add to 120 milliliters of the cough medicine so that it contains only 20% alcohol?

Question 273788: A cough medicine contains 25% alcohol. How much liquid should a pharmacists add to 120 milliliters of the cough medicine so that it contains only 20% alcohol?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A cough medicine contains 25% alcohol. How much liquid should a pharmacists add to 120 milliliters of the cough medicine so that it contains only 20% alcohol?
--------------------------
Equation:
alcohol + alcohol = alcohol
0.25*120 + 0*x = 0.20(120+x)
Multiply thru by 100 to get:
25*120 + 0 = 20*120 + 20x
---
20x = 5*120
x = 25 milliliters ( amt. of "liquid" that must be added to the mixture)
================
Cheers,
Stan H.

RELATED QUESTIONS
A cough medicine contains 25% alcohol. How much liquid should a pharmacist add to 120... (answered by checkley71)

I do not know how to write the equation to solve this problem. A cough medicine contains (answered by stanbon)

At the end of the day, a pharmacist counted and found she has 4/3 as many prescriptions... (answered by ikleyn,greenestamps)

The doctor finally figures out what is wrong with you and prescribes a medicine that will (answered by ikleyn)

Dr. Palma prescribes 10 ml of a 10%-solution of medicine. The pharmacist has a... (answered by ewatrrr)

A nurse has one solution that is 24% medicine and another that is 52% medicine. How much... (answered by jorel1380,greenestamps)

I need help setting up this problem. A prescription requires a cough syrup to contain... (answered by mananth)

A liquid medicine solution is 1% liquid Curitall by volume. To the nearest mL, how much... (answered by ptaylor)

A liquid medicine solution is 13% liquid Curitall by volume. To the nearest mL, how much... (answered by ankor@dixie-net.com)