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 answer step by step:
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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: 3.
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