Question

40 litres of milk contain 20% water find the water added to the milk so that it. may contain 40% water

Answer 1

40 litres of milk contains 20% water 20% of 40 litres=20 x 40 /100 =8 litres 40% of 40 litres=40 x 40 /100 =16 litres. As milk already contains 20% of 40 litres that is 8 litres So if we add another 8 litres means total 16 litres water in 40 litres mitres will make 40% water in it.