Milk contains 5 % water . What quantity of pure milk should be added to 10 litres of mil to reduce this to 2% ?
Quantity of water in 10 litres = 5% of 10 litres = 0.5 litres.
Let `x` litres of pure milk be added . Then , `(0.5)/(10 + x) = 2/100 hArr 2x = 30 hArr x = 15`
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