A shop sells 1 chocolate at $1 you can exchange 3 wrappers for 1 chocolate .if you have $!5 how many

Well if you have $5, and each chocolate is at $1, you can get 5 chocolates. You can then trade the wrappers of 3 of the chocolates with another chocolate. You now have six chocolates - one with a wrapper still on, and 2 wrappers. Combine these wrappers, and trade them, you will be able to get 7 chocolates in total.

Hopefully this helped!