Try drawing diagrams to help with this question., simplifying can make the question easier to solve.
here are some of the answers to this question:
1/2, 3/6, 7/100 3/10, and many more
1 litre = 1000 ml
1 ml = 1 / 1000= 0.001 litre
150 ml = 150 / 1000 = 0 .15 litre
4 + 0.15 = 4.15 litres