John and Sam were hungry so they ordered an extra-large pizza that was pre-sliced into 12 pieces. John ate 3 slices while Sam ate twice the amount that John ate. How many slices of pizza were left?
Let’s work this out in a step by step way to be sure we have the right answer.
3
Sam had twice the amount of John so Sam ate 3 * 2 = 6 slices.

Together, they ate 3 + 6 = 9 slices.

1 pizza has 12 slices.

9 slices were eaten so 12 - 9 = 3 slices left.

.

The answer is 3