If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall?
To find the length of the wall, we need to convert the given measurements into the same units and then calculate the total length.
First, let's convert the height of the wall to inches since the measurements of the bricks are given in inches.
1 foot = 12 inches
42 feet = 42 * 12 = 504 inches
Now, let's find the total length of the wall by multiplying the number of bricks by their width:
Number of bricks = 400
Width of each brick = 31 inches
Total length = Number of bricks * Width of each brick
Total length = 400 * 31 = 12400 inches
Therefore, the wall is 12,400 inches long.
42 ft = 504 inches
504/31 = approx. 16 bricks high
400/16 = 25 bricks long
Take it from here.