milk contains 5 % water . what quantity of pure milk should be added to 10 litres of milk to reduce this to 2 % ?
"here required quantity of pure milk = 10 × ( 5 − 2 ) / 2 = 10 × 3 / 2 = 15 litres . answer c"
subtract(divide(multiply(divide(5, const_100), 10), divide(2, const_100)), 10)