Question 362077
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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