Alcohol mixing

How much 64% of the alcohol must be poured into 6 liters of 85% alcohol to produce 79% alcohol?

Correct result:

x =  2.4 l

Solution:

 0.64x+6 0.85=0.79 (x+6)  0.64 x+6 0.85=0.79 (x+6)  0.15x=0.36  x=125=2.4=125 l=2.4 l



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