Final answer:
Each person in the room ate 1/3 of a pizza, and with 15 people in total, they consumed 5 whole pizzas.
Step-by-step explanation:
To find out how many pizzas were eaten when there are 15 people in a room and each person ate 1/3 of a pizza, we can calculate it as follows:
Since each person ate 1/3 of a pizza, and there are 15 people, we multiply 15 by 1/3 to get the total amount of pizza eaten:
= 15 people × (1/3 pizza/person)
= 15/3
= 5 pizzas.
Therefore, 5 whole pizzas were eaten by the 15 people in the room.