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
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
