A stair with a total rise of 7?-7? and a total run of 9?-0?, with the stairwell header used as the last riser, requires
_____ treads with a _____ unit run.
A) 11 treads; 9? wide
B) 11 treads; 9-1/2? wide
C) 12 treads; 9? wide
D) 12 treads; 9-1/2? wide
Answer: C
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