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Which pair of ratios is NOT proportional?

a. 24/27 and 16/18 c. 6/15 and 8/20

b. 6/9 and 30/45 d. 20/24 and 15/21

1 Answer

4 votes
I think that D would be the correct choice. 24 and 21 do not have a common denominator, given that 20 goes into 24 in factors of two and 15 goes into 21 in factors of 3. 24 and 21 (denominators) do not share a common factor.

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