You have diving lessons every fifth day and swimming lessons every third day. Today you have both lessons. In how many days will you have both lessons on the same day again?
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after 15 days
diving is on 0 , 5 , 10 , 15 , 20 , ... days
swimming is on 0 , 3, 6 , 9, 12 , 15 , 18 , ... days
the next will be in 15 days
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please refer to the attachment
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