Verified Answer :

mrsmartypants

I think it is 2:3 because when you divide them both by nine you get 2:3 and that is as simple as it can get.

To find the simplest form, we divide both sides by a number.

18/3 = 6
27/3 = 9

6/3 = 2
9/3 = 3

Final answer:           2:3

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