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Let x=number of litres of 40% alcohol solution. The amount of alcohol is 0.4x litres.

20 litres of 80% alcohol contains 20×0.8=16 litres of alcohol.

The amount of mixture is 20+x litres and it contains 0.6(20+x) litres of alcohol.

So 0.4x+16=0.6(20+x)=12+0.6x.

Therefore 16-12=0.2x, 0.2x=4 and x=4/0.2=40/2=20 litres.

We need 20 litres of 40% alcohol solution.

by Top Rated User (695k points)

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