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16 October, 13:11

A lot is 21 ft by 30 ft. To support a fence, an architect wants an upright post at each corner and an upright post every 3 ft in between. How many of these posts are needed?

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  1. 16 October, 17:01
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    What we know:

    Lot = 21 x 30ft

    Perimeter=2l+2w

    Want to put 4 corner post and one post every 3 ft

    What we need to find:

    How many post we need.

    Perimeter=2 (21) + 2 (30) = 42+60=102ft

    102/3=34

    34 posts are needed.
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