1 flip = 2 cats
10 strings = 4 heads
3 pigs = 5 strings
1 flea = 7 heads
5 smacks = 1 head
3 cats = 7 pigs

1. How many flips in 65 heads

2. How many fleas in 23 smacks

3. How many strings in 12 cats

4. How many cats are in 10 heads