Posted by **Sandy** on Wednesday, April 9, 2014 at 7:38pm.

I get a black strip every 10 days. A white strip every 20 days, and a red strip every 21 days. I just got all 3 strips. How long 'till I get all of them again on the same day?

- Math -
**bobpursley**, Wednesday, April 9, 2014 at 7:40pm
What is 7*3*2*5?

- Math -
**Anonymous**, Wednesday, April 9, 2014 at 7:43pm
210

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