A masonry opening head is detailed at 7 ft 4 in. above the slab. Using standard 8 in. CMU coursing, how many full courses reach that height?
Correct Answer
B) 11 courses
The height is 7 ft 4 in. = 88 in. Standard CMU coursing is 8 in. per course, so 88/8 = 11 courses. Other choices use a different module or misconvert feet to inches.
Why This Is the Correct Answer
The height is 7 ft 4 in. = 88 in. Standard CMU coursing is 8 in. per course, so 88/8 = 11 courses. Other choices use a different module or misconvert feet to inches.
Why the Other Options Are Wrong
Option A: 10 courses
cmu coursing, choice a: 10 courses backs into 0.91 when divided by 88/8; the accepted setup gives 1 on that same base.
Option C: 12 courses
cmu coursing, choice b: 12 courses is produced by 4 + 8. The error is using that partial/alternate setup.
Option D: 9 courses
cmu coursing, choice c: 9 courses backs into 0.82 when divided by 88/8; the accepted setup gives 1 on that same base.
Memory Technique
Store CMU coursing with its last math move; nearby answers are usually unfinished versions of 11 courses.
Reference Hint
Open Modern Masonry - Brick, Block, Stone, 9th Ed., 2020; use the index entry or section for "CMU modular coursing" to confirm that The height is 7 ft 4 in.
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