Part A
7 apples are shared amongst 3 persons, we have:

The number "2" implies that everyone gets 2 apples each
The number "1" implies that after everyone had picked their apples, that's what was left
The number "3" represents the number of persons amongst whom the apples were shared
Part B
For example, you bought a pizza of 4 slices for yourself. You actually bought 1 pizza but in real-time, you have 4 pieces of pizza to yourself
