1.

In a 150-litre mixture of milk and water, the percentage of milk is 84%. How much water should be added so that the percentage of milk becomes 52.5% ?

Answer»

90 LITRE



In 150 litre, milk is 84%
ie 150 x 84/100 = 126 litre 
Let us add x litres of water
Therefore, the quantity of mixture = 150 + x
∴ 52.5% of (150 + x) = 126 litres 
150 + x = 126x100/52.5 = 240 litres
∴ x = 240 - 150 = 90 litres



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