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1 May, 07:35

If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall? feet.

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  1. 1 May, 10:07
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    Let b bricks:

    b = 400, let H height and l length

    Area = 81*31 or 6.75*2.58 = 17.44 ft²

    b (17.44ft²) = Hl

    400 (17.44 ft²) = 42 l

    l = 6975/42 = 166.07

    so the length of the wall is 166 ft approximately as a whole number
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