Question

what volumne of ethyl acohol and water must be together to prepared 250 ml of 60% by volumne of alcohol in water

Answer 1

Concentration = solute / solution × 100
let ethyl alchohol be x
60=x/(250+x)
15000 +60x= x
60x-x=-15000
59x=15000
x=15000/59

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Answer 2

Let the amount of alcohol be x.
Solute(alcohol)=x
Solution=250ml
Solute×100÷solution=60
100x÷250=60
x=60×250÷100
x=150
Alcohol=x=150ml
Water=250-150
=100ml