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3rd grade math

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a male black widow spider is half the size of a female black widow spider. together they are 21 millimeter in length. how big is a female black widow

  • 3rd grade math -

    Divide 21 by 3.

    The female is 2 of those thirds.
    The male is 1 of those thirds.

  • 3rd grade math -

    the solution is.......17,

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