Math

I posted a question, but realized due to my multitasking, completely messed up the question.

My question is Which ratios form a proportion?
A. 4/9, 12/25
B. 3/7, 18/42
C. 5/11,20/45
D. 5/8, 15/25

I don't understand how to find the answer, could someone help?

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  1. One way to do this is to set up a proportion and cross multiply.

    4/9 = 12/25
    108 = 100
    Nope

    Try the others that way.

  2. So the answer would be B?

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  3. Yes, B.

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