Question 1123850
let x stand for the number of liters of the 25% solution
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let y stand for the number of liters of the 85% solution
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x + y = 80, therefore
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x = (80-y)
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0.40 * 80 = 32 liters of acid
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0.25(80-y) + 0.85y = 32
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20 - 0.25y + 0.85y = 32
:
0.60y = 12
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y = 20
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x = 80 - 20 = 60
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We need 60 liters of the 25% solution and 20 liters of the 85% solution
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Note (0.25 * 60) + (0.85 * 20) =  32 liters
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