General Contractor Exam 2025 – 400 Free Practice Questions to Pass the Exam

To determine how many pieces of copper are needed for the curb on the skylight, we need to calculate the effective length of each piece when accounting for the overlap.

Each piece of copper is 10 feet long, but with an overlap of 6 inches, which is equivalent to 0.5 feet. Thus, the effective length that contributes to the curb is calculated as follows:

Effective length of each piece = Total length - Overlap length

= 10 feet - 0.5 feet

= 9.5 feet

Next, we need to know the total length required for the curb. Assuming it’s a specific measurement (not given in the question but let's say it is 100 feet for illustrative purposes), we divide the total length of the curb by the effective length of each piece to determine how many pieces are required.

If the total length of the curb is divided by the effective length (9.5 feet):

100 feet / 9.5 feet per piece = 10.526 pieces

Since you cannot have a fraction of a piece, you would round up to the next whole number, arriving at 11 pieces.

To consider various lengths for the total curb length, if the total measured length of the curb is