Michigan Residential Builders License Practice Test

How many cubic yards of concrete are needed for a driveway that is 60 feet long, 20 feet wide, and 6 inches thick?

1. 15 cubic yards

2. 20 cubic yards

3. 23 cubic yards

4. 30 cubic yards

The correct answer is: 23 cubic yards

To determine how many cubic yards of concrete are needed for a driveway measuring 60 feet in length, 20 feet in width, and 6 inches in thickness, it's essential to first convert all measurements into consistent units and then calculate the volume. 1. **Convert thickness from inches to feet**: Since 6 inches is equivalent to 0.5 feet, the dimensions of the driveway are now: - Length: 60 feet - Width: 20 feet - Thickness: 0.5 feet 2. **Calculate the volume in cubic feet**: The volume can be calculated using the formula for the volume of a rectangular prism (Length x Width x Height). Thus, the calculation in cubic feet is: - Volume = 60 feet (length) x 20 feet (width) x 0.5 feet (thickness) = 600 cubic feet. 3. **Convert cubic feet to cubic yards**: There are 27 cubic feet in one cubic yard. The number of cubic yards of concrete needed can be found by dividing the volume in cubic feet by 27: - Volume in cubic yards = 600 cubic feet ÷ 27 = approximately 22.22 cubic yards.