what is the number of risers required and their unit rise when building a stair with a total rise of…

what is the number of risers required and their unit rise when building a stair with a total rise of 7-7\?\no 11 risers, each 7-1/2\ high\no 12 risers, each 7\ high\no 13 risers, each 7\ high\no 14 risers, each 7-1/4\ high

what is the number of risers required and their unit rise when building a stair with a total rise of 7-7\?\no 11 risers, each 7-1/2\ high\no 12 risers, each 7\ high\no 13 risers, each 7\ high\no 14 risers, each 7-1/4\ high

Answer

Answer:

B. 12 risers, each 7" high

Explanation:

Step1: Convert total rise to inches

First, convert 7'-7" to inches. 7 feet is 7×12 = 84 inches, and adding 7 more inches gives 84 + 7=91 inches.

Step2: Check option A

For 11 risers each 7 - 1/2" high, 11×7.5 = 82.5 inches, which is not 91 inches.

Step3: Check option B

For 12 risers each 7" high, 12×7 = 84 inches, which is not 91 inches.

Step4: Check option C

For 13 risers each 7" high, 13×7 = 91 inches, which is the correct total - rise.

Step5: Check option D

For 14 risers each 7 - 1/4" high, 14×7.25 = 101.5 inches, which is not 91 inches.