3 is to 9 as 7 is to what?

22 Answers

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  • Jim
    Lv 7
    10 months ago

    Add

    3 +6 = 9, so 7+6 = 13

    Multiply

    3*3 = 9 so 7*3 = 21

    Exp:

    3² =9, so 7² =49

    Or an infinite number of equations...

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  • 10 months ago

    13, 21 or 49. I'm not sure what other relationships exist between the given numbers.

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  • 11 months ago

    The square root of 49 ... sqrt(49)

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  • Anonymous
    11 months ago

    Is related to 21.

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  • 11 months ago

    3/9 = 7/x

    3x = 63

    x = 21

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  • 11 months ago

    Probably 21, 'what' being a variable here is that, a variable.

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  • 11 months ago

    To solve this type of problem, use a proportion.

    3 ÷ 9 = 7 ÷ x

    3 * x = 63

    x = 21

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  • 11 months ago

    Arithmetically, 13

    Geometrically, 21

    Exponentially, 49

    etc.

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  • Mark
    Lv 7
    11 months ago

    21 (3 x 3 = 9 and 7 x 23 = 21).

    • darkhorse10 months agoReport

      7 x 23 = 161 not 21.

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  • 11 months ago

    Unanswerable. It could be 21 (3x3=9, 3x7=21) or it could be 49 (3^2=9, 7^2=49). Or you could come up with complicated formulas for other numbers.

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