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Question:

Laura goes to the grocery store every 5 days and Tim goes to the same grocery store every 6 days. If Laura and Tim both went to the grocery store today, when is the next time they will both go to the grocery store on the same day?

A
30 days

Explaination

To solve this problem, you must find the least common multiple of 5 and 6, which is the smallest multiple common to both numbers. To do this, make a list of multiples for each number until at least two multiples are on both lists. 5: 5, 10, 15, 20, 25, 30… 6: 6, 12, 18, 24, 30… The lowest common multiple of both numbers is 30.