Question

Ronald and Tim both did their laundry today. Ronald does laundry every 6 days and Tim does laundry every 9 days. How many days will it be until Ronald and Tim both do laundry on the same day again

Answer 1

18 is divisible by 6 and 9, and is the least common multiple. So, it will be 18 days before Ronald and Tim do laundry on the same day
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Answer 2

it'll be 18 days untill they do it the same day