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25 January, 06:40

There are 7 animals a farmer's field.



Some are cows and some are chickens.

The farmer counts 18 legs in all.

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Answers (1)
  1. 25 January, 06:43
    0
    2 cows and 5 chickens.

    Step-by-step explanation:

    NOTE: This will be solved using simultaneous equations.

    Let x = cows and y = chickens

    1. form two equations

    4x + 2y = 18 ... (1)

    x + y = 7 ... (2)

    2. make y (or x) the subject of one equation

    x + y = 7

    y = 7 - x ... (3)

    3. Substitute (3) into (1)

    4x + 2 (7 - x) = 18

    4. solve for x

    4x + 14 - 2x = 18

    2x = 4

    x = 2

    5. Now substitute x value into equation (2)

    x + y = 7

    2 + y = 7

    y = 5

    ∴ cows (x) = 2

    chickens (y) = 5
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