Problema Solution
A pharmacist wishes to mix a solution that is 4% Minoxidil. She has on hand 80 ml of a 2% solution and wishes to add some 6% solution to obtain the desired 4% solution. How much 6% solution should she add?
Answer provided by our tutors
let 'x' represent the amount of 6% solution used, then 'x+80' represents the final amount of 4% solution
0.04(x+80) = 0.02(80) + 0.06(x)
solving for 'x' we have x=80
she should use 80ml of the 6% solution