Question 365004
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Hi, 
Let x represent amount of pure acid(this will be an 100% solution) (90L-x the 10% solution
Write as we Read***
.10(90L-x) + 1.00x = .75*90L
solving for x
.90x = .65*90L
x = 65L, the amount of pure acid. 
(90-65L)=25L   the amount of the 10% solution
checking our answer
2.5 + 65 = 67.5