every 3 days William has to take medication for his back. Every 7 days he has to take medication for asthma. On what day will William take both medications?

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asked Jul 21, 2019 27.8k views

4 votes

every 3 days William has to take medication for his back. Every 7 days he has to take medication for asthma. On what day will William take both medications?

Mathematics
middle-school

RommelTJ asked

by RommelTJ

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1 vote

It’s the second Saturday that he would take both medications

Cdmdotnet answered Jul 22, 2019

by Cdmdotnet

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3 votes

Okay, well we're gonna find the LCM (least common multiple)

3: 3, 6, 9, 12, 15, 18, 21

7: 7, 14, 21

So...21 days

Xarus answered Jul 25, 2019

by Xarus

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