Date both clean on same day

Lew and Sue agree on a schedule for cleaning their rooms. Lew will clean once every 3 days and Sue will clean once every 5 days, They both will clean their rooms on saturday April 1. What is the next date they will clean on the same day.
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2 Answers

May 6th
by
April 16th.

The LCM of 3 and 5 is 15 so count 15 days from April 1st.
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