Question

Mrs. Cindy needs to order new balls for the school students to use at recess. She asks the students what balls she should order. One-third of the students want Mrs. Cindy to order soccer balls. One-third of the students want Mrs. Cindy to order basketballs. One-sixth of the students want Mrs. Cindy to order footballs. Fifteen students want Mrs. Cindy to order kickballs. How many students did Mrs. Cindy ask about ordering new balls for recess?

Answer 1

1/3 + 1/3 + 1/6 = 5/6

1 - 5/6 = 1/6

1/6x = 15

x = 15/(1/6)

x = 15 * 6

x = 90