Question

18. A mixture of 70 litres of alcohol and water contains 10% of water. How much water must be added to the above mixture to make the water 12.5% of the resulting mixture? (a) 1 litre (b) 1.5 litre (c) 2 litres (d) 2.5 litres

Answer 1

So ratio of W and A becomes 1:9.

To make 12.5% water. Alcohol will be 87.5%.

So new ratio becomes 1:7.

Now multiply by 7 in the first ratio and multiply by 9 in the 2nd ratio. To equate the quantity of Alcohol.

New 1st ratio- 7:63

New 2nd ratio- 9:63

Additional Water=9-7= 2L

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