Kim buys 3 pizzas.  They are 12 slices each.  The pizza cost $72.  How much did 5 slices cost?
he got 3*12=<<3*12=36>>36 slices
So each slice cost 72/36=$<<72/36=2>>2
So 5 slices would cost 5*2=$<<5*2=10>>10
#### 10