A tenant floor has 14 single-leaf office doors, 3 pair doors, and 2 single-leaf restroom doors. Counting one hardware set per active leaf, how many hardware sets are needed?
Correct Answer
C) 22 sets
Single-leaf doors require 14 + 2 = 16 sets. Three pair doors have two active leaves each, so 3 x 2 = 6 sets. Total hardware sets are 16 + 6 = 22. Other choices count each pair as one set or add extra restroom sets.
Why This Is the Correct Answer
Single-leaf doors require 14 + 2 = 16 sets. Three pair doors have two active leaves each, so 3 x 2 = 6 sets. Total hardware sets are 16 + 6 = 22. Other choices count each pair as one set or add extra restroom sets.
Why the Other Options Are Wrong
Option A: 19 sets
door hardware sets, choice a: 14 + 3 + 2 gives 19 sets. That calculation adds three listed values.
Option B: 20 sets
door hardware sets, choice b: 20 sets is off by 2 from the checked result 22 sets because it misuses the 2 item (2 single-leaf restroom doors).
Option D: 24 sets
door hardware sets, choice c: 24 sets is off by 2 from the checked result 22 sets because it misuses the 2 item (2 single-leaf restroom doors).
Memory Technique
Store door hardware sets with its last math move; nearby answers are usually unfinished versions of 22 sets.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Door hardware quantity takeoff" to confirm that Single-leaf doors require 14 + 2 = 16 sets.
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