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17 June, 21:39

If fence posts are to be placed in a row 5 m apart, how many posts are needed for 100 m of fence?

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  1. 17 June, 21:51
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    20 posts are needed for 100m of fence.

    Step-by-step explanation:

    This question can be solved by a simple rule of three.

    Fence posts are to be placed in a row 5 m apart.

    This means that 1 post is needed for 5m of fence.

    How many posts are needed for 100 m of fence?

    1 post - 5m

    x posts - 100m

    5x = 100

    x = 100/5

    x = 20

    20 posts are needed for 100m of fence.
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