How many 9" treads will there be in a set of stairs with a height between floors of 9'6"?

How many 9" treads will there be in a set of stairs with a height between floors of 9'6"?

• A. 13
• B. 26
• C. 15
• D. 14

Answer: (C)

To determine the number of 9-inch treads in a set of stairs that need to accommodate a total rise of 9 feet 6 inches, you first need to convert the total height into inches. There are 12 inches in a foot, so 9 feet 6 inches is equivalent to: 9 feet × 12 inches/foot = 108 inches 6 inches = 6 inches Total height = 108 inches + 6 inches = 114 inches. The next step is to recognize the formula that relates the rise of the stairs to the number of treads and risers. A common rule of thumb in stair design is that the total rise divided by the height of each riser will provide the number of risers needed. Typically, a riser height of about 7.5 inches is standard, but for this example, a rise of 9 inches per tread is being considered. To find out how many risers there are, you divide the total rise of 114 inches by the height of the riser. If each tread is designed with a height of 9 inches, the calculation would be: 114 inches ÷ 9 inches/riser = 12.67 risers. Since the number of

To determine the number of 9-inch treads in a set of stairs that need to accommodate a total rise of 9 feet 6 inches, you first need to convert the total height into inches. There are 12 inches in a foot, so 9 feet 6 inches is equivalent to:

9 feet × 12 inches/foot = 108 inches

6 inches = 6 inches

Total height = 108 inches + 6 inches = 114 inches.

The next step is to recognize the formula that relates the rise of the stairs to the number of treads and risers. A common rule of thumb in stair design is that the total rise divided by the height of each riser will provide the number of risers needed. Typically, a riser height of about 7.5 inches is standard, but for this example, a rise of 9 inches per tread is being considered.

To find out how many risers there are, you divide the total rise of 114 inches by the height of the riser. If each tread is designed with a height of 9 inches, the calculation would be:

114 inches ÷ 9 inches/riser = 12.67 risers.

Since the number of