A solution 2

To a solution of 30 litres containing 90% alcohol, how much water must be added to so that the alcohol becomes 80%?

Correct answer:

V =  3.75 l

Step-by-step explanation:

V1=30 l r1=90%=10090=109=0.9 r2=80%=10080=54=0.8  r2 =  V1+Vr1 V1  r2 (V1+V)=r1 V1 0.8 (30+V)=0.9 30  0.8V=3  V=0.83=3.75  V=415=3.75=3.75 l



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