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Elodia [21]
3 years ago
14

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

Mathematics
2 answers:
JulsSmile [24]3 years ago
6 0

Answer:

166

Step-by-step explanation:

The person above calculated inches.  Need to take 1992.85 and divide by 12 to get 166

Arisa [49]3 years ago
3 0

81 x 31 = 2 511 (area of a brick)


2511 x 400 = 1 004 400 (area of the wall)


Convert 1 004 400" to ft. [1ft. = 12"]


1 004 400 / 12 = 83 700 ft.


Now this is what we have.

-Hight 42 ft.

-Length X ft.

-Area 83 700ft.


Algebra time.


42 x X = 83 700 (to get X you would devide 83 700 by 42)


83 700 / 42 = 1 992.85ft. (X = 1 992.85ft.)


So the length of the wall would be 1992.85ft.

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