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Question

My last question its probably easy I'm just really tired tonight//

Q) John stocks the vending machines at Rose Hill Elementary School every 9 school days and Nassaux Intermediate School every 6 school days. In September, he stocked both schools on the 27th. How many school days earlier had he stocked the vending machines at both schools on the same day?

Answer 1

18

Answer 2

he stocked them both on the 9th, or 18 days earlier.  

a common multiple of both numbers:

9, 18, 27, 36, ...

6, 12, 18, 24, ...

18 is the common number, so every 18 days he should be at both places.  

Answer 3

5? that is way way way off it 18 school days ago  

Answer 4

5