SOLUTION: Every 21 days Janice visits her grandma and every 29 days she visits her grandpa, how many days before she visits both grandparents on the same day?

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Question 1012084: Every 21 days Janice visits her grandma and every 29 days she visits her grandpa, how many days before she visits both grandparents on the same day?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
One may make a data table to look at the multiples, but no common factors between 21 and 29.

21%2A29
609 days