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OpenStudy (anonymous):
jo has swimming lessons every 3 days and violin lessons every 7 days.how many days would it take to have both lessons on the same day?
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OpenStudy (anonymous):
21 days
OpenStudy (anonymous):
every 21 days
OpenStudy (kira_yamato):
LCM of 3 and 7 is 21. So it takes 21 days to have both lessons on the same day.
OpenStudy (anonymous):
just look at the tables of 3 and 7 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ....... 7, 14, 21, 28, 35, 42, ............................. Their least common multiple is 21 so after every 21 days
OpenStudy (anonymous):
7*3=21
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