Question

A vessel of 80 liters is filled with milk and water.70% of milk and 30% of water is/taken out of the vessel

Answer 1

milk = x litres

water = y litres..

x + y =80...(1)

now,

30x/100 + 70y/100 = 80*45/100

so 3x + 7y = 360...(2)

solve these 2 equations..

y = 30, x = 50!