Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the total number of board feet in twelve 2x10's that are 20 feet long?

1. 400

2. 600

3. 650

4. 800

The correct answer is: 400

To determine the total number of board feet in twelve 2x10's that are 20 feet long, it's essential to understand how to calculate board feet. Board feet is a measurement used in the lumber industry to quantify the volume of lumber. The formula for calculating board feet is: **Board Feet = (Thickness in inches) x (Width in inches) x (Length in feet) / 12.** In this case, each 2x10 board has dimensions of 2 inches in thickness and 10 inches in width. However, given that lumber is typically measured based on nominal dimensions as opposed to the actual dimensions, the actual thickness of a 2x10 is approximately 1.5 inches and its width is about 9.25 inches. Despite that, for the sake of keeping it simple and intuitive for this question, we’ll work with the nominal dimensions. 1. Calculate the board feet for one 2x10 that is 20 feet long: - Thickness = 2 inches - Width = 10 inches - Length = 20 feet Plugging these values into the formula: **Board Feet for one board = (2 x 10 x 20) / 12 =