15 cats, 10 have stripes, 7 have stripes and green eyes, how many cats have just green eyes

Discussion in 'Calculator Requests' started by math_celebrity, Oct 28, 2016.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    Let G be green eyes and S be Stripes, and SG be Stripes and Green Eyes.

    Set up an equation
    Total Cats = Green Eyes + Stripes - Green Eyes and Stripes
    15 = G + 10 - 7
    15 = G + 3

    Subtract 3 from each side:
    G = 12
     

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