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25 May, 12:22

Bob keeps his cows and ducks in a barn. There are 13 animals in the barn and all together they have 34 legs. How many cows are there and how many ducks

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  1. 25 May, 14:58
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    4 cows and 9 ducks

    Step-by-step explanation:

    X is cows and Y is ducks

    X+Y = 13

    4*X + 2*Y = 34

    - X+Y = 13

    -4*X + 2*Y = 34

    4*X + 2*Y = 34

    2*X + 2*Y = 26

    2*X = 8

    X = 4

    X+Y = 13

    Y = 13-4

    Y=9
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