Question

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Answer 1

9 pizzas are pepperoni 3pizzas are mushroom and the other 6 are plain

Answer 2

3 pizzas were plain.

Half of 18 is 9. So 9 pizzas were pepperoni.

A third of 18 is 6. So 6 pizzas had mushrooms.

9+6 = 15. 18-15 = 3.