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Question

Rebecca goes swimming every 3 days, Fiona goes swimming every 6 days, and Kimberly goes swimming every 9 days. They met one another on 10th June, which is the next date they will meet again?

Is below solution correct?

smallest common multiple of 3, 6, 9 = 18

next smallest common multiple of 3, 6, 9 = 36

No. of days = 36 – 18 = 18

Next date they meet = 10 + 18 = 28 June

Answer

Why must you calculate the NEXT common multiple?  I would think you just take the common multiple and add it to the 10th of June.

1 Reply 1 Like

Oh does it mean that all 3 of them will always meet one another every 18 day?

In that case, next common multiple is not required step.  Can straightaway 10 + 18 = 28th June. 

is this correct?

1 Reply 1 Like

I believe so 🙂  they should meet every 18th day.

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