A sample of milk contains 5% water. What quantity of pure milk should be added to 10 litres of milk to reduce the water content to 2%? (a) 5 litres (b) 7 litres (c) 15 litres (d) 12 litres (e) None of these

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1. ( c ) 15 litres

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2. Current litres= 10
   Initial %=5
   Final % =2
   Direct Formula = (Current Litres*( Initial %-final %))/Final
   %—>10*3/2=15 Litres

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