Answer :
1 litre = 1000 ml
1 ml = 1 / 1000= 0.001 litre
150 ml = 150 / 1000 = 0 .15 litre
4 + 0.15 = 4.15 litres
1 ml = 1 / 1000= 0.001 litre
150 ml = 150 / 1000 = 0 .15 litre
4 + 0.15 = 4.15 litres