SOLUTION: quantity of 40% acid solution and another quantity of 10% acid solution must be mixed to form 15L of solution that 20% acid. how much of each must be mixed?

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Question 362077: quantity of 40% acid solution and another quantity of 10% acid solution must be mixed to form 15L of solution that 20% acid. how much of each must be mixed?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, 

Let x represent the amount of 40% solution 

then (15L -x) will be the amount of the 10% solution

.40x + .10(15L-x)= .20*15L

solving for x

.30x = .10*15L

x = 5L of the 40% solution and 10L of the 10% solution



checking our answer

.40*5 + .10 *10 =  2 + 1 = 3= .20*15