Question

Emilio's family volunteers at the local soup kitchen every 30 days. Emilio has swimming lessons every 9 days. He has both activities this Saturday. When will he have both activities again on the same day?

Answer 1

He will have both activities again on a Thursday

Answer 2

Emilio will have both activities again 90 days from Saturday.

Explanation:

Emilio's family volunteers at the local soup kitchen every 30 days.

Emilio has swimming lessons every 9 days.

30 = 2 x 3 x 5

9 = 3 x 3

LCM = 2 x 3 x 3 x 5 = 90

So, Emilio will have both activities again 90 days from Saturday.