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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03-05-2018
Mathematics

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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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popalabdulqayou popalabdulqayou · Answer 1 · 2018-05-14T03:21:10+02:00

popalabdulqayou popalabdulqayou

14-05-2018

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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