Amount of pizza that is left = 12/15
= 4/5
The size of each pizza that can be made from the left over pizza = 3/10
Then
Number of pizza's that can be made
from the left over pizza = (4/5)/(3/10)
= (4 * 10)/(5 * 3)
= 40/15
= 8/3
= 2 2/3
So 2 2/3 pizza's can be made from the pizza that is left over. I hope the above deduction is simple enough for you to understand. You can definitely use this method in future for solving similar problems without requiring any additional help from outside.
