Question

Bricklayers use the formula N = 7LH to estimate the number of bricks N needed to build a wall of height H and length L. What is the height of a wall that is 30 feet long and that requires 2,310 bricks to build? a. 12 ft c. 11 ft b. 10 ft d. 20 ft

Answer 1

For this case we have the following equation:
 N = 7LH
 Clearing H we have:
 H = N / (7L)
 Substituting the values we have:
 H = 2310 / (7 (30))
 Rewriting we have:
 H = 2310/210
 H = 11 feet
 Answer:
 the height of a wall that is 30 feet long and that requires 2,310 bricks to build is:
 c. 11 ft