A footing that measures 900 feet long, 3 feet wide, and 1 foot deep requires how many cubic yards of concrete?

To determine how many cubic yards of concrete are needed for the footing, you need to first calculate the volume of the footing in cubic feet. The formula for the volume of a rectangular prism is length × width × height (or depth).

In this case, the footing is 900 feet long, 3 feet wide, and 1 foot deep. So, you would multiply these dimensions together:

Volume = 900 feet × 3 feet × 1 foot = 2700 cubic feet.

Next, to convert cubic feet into cubic yards, you need to know that there are 27 cubic feet in a cubic yard (since 1 yard = 3 feet, therefore 1 cubic yard = 3 feet × 3 feet × 3 feet = 27 cubic feet).

To convert the volume of the footing from cubic feet to cubic yards, divide the total volume in cubic feet by 27:

2700 cubic feet ÷ 27 = 100 cubic yards.

Thus, the correct answer is that the footing requires 100 cubic yards of concrete. This process illustrates the importance of understanding volume calculation and unit conversion when estimating material requirements in masonry work.