Question

Kevin, Michael and Darren all do their own laundry at home. Kevin does his laundry every 9 days, Michael every 10 days, and Darren every 12 days. If they all did their laundry today, in how many days will the three of them all do their laundry again on the same day?

A. 100 Days
B. 144 Days
C. 180 Days
D. 212 Days

Answer 1

In 180 days the three of them will do their laundry again on the same day.

Explanation:

we need to find the least common factor or 9, 10 and 12:

LCM(9, 10, 12) = 180