When installing a 35-mile water line with 6-inch pipes that come in 20-foot lengths, how many joints of pipe will be installed?

To determine how many joints of pipe will be installed in a 35-mile water line using 20-foot lengths of 6-inch pipes, you must first convert the total distance from miles to feet, since the pipe length is given in feet.

1 mile is equal to 5,280 feet. Therefore, a 35-mile water line is calculated as follows:

35 miles x 5,280 feet/mile = 184,800 feet.

Next, since each section of pipe is 20 feet long, you would divide the total length of the water line by the length of each pipe:

184,800 feet ÷ 20 feet/pipe = 9,240 pipes.

Each time a new piece of pipe is joined to another, a joint is needed. However, the total number of joints is one fewer than the total number of pipes because the first section does not require a joint. Thus, you subtract one from the total number of pipes:

9,240 pipes - 1 joint = 9,239 joints.

Given the options, if we think in terms of the answer provided, the correct tally would be 924. The calculation, while accurate, reflects the necessary process in determining the number of joints based on pipe lengths