A storefront opening is 48 ft wide and 10 ft high. Deduct two aluminum entrance doors, each 3 ft by 7 ft, from the glazed area. What net glass area remains?
Correct Answer
A) 438 sf
Gross opening area is 48 x 10 = 480 sf. The two doors deduct 2 x 3 x 7 = 42 sf, leaving 480 - 42 = 438 sf. Other choices deduct one door, ignore the doors, or add door area.
Why This Is the Correct Answer
Gross opening area is 48 x 10 = 480 sf. The two doors deduct 2 x 3 x 7 = 42 sf, leaving 480 - 42 = 438 sf. Other choices deduct one door, ignore the doors, or add door area.
Why the Other Options Are Wrong
Option B: 456 sf
storefront glass area, choice b: 456 sf adds an extra unstated add-on/subtraction; the numeric gap is 18.
Option C: 480 sf
storefront glass area, choice c: 480 sf is an intermediate from the steps (Gross opening area is 48 x 10 = 480 sf.); the calculation continues to 438 sf.
Option D: 522 sf
storefront glass area, choice d: 522 sf adds an extra unstated add-on/subtraction; the numeric gap is 84.
Memory Technique
Keep a ledger line beside storefront glass area: if one number is skipped, the option drifts away from 438 sf.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Storefront glazing area takeoff" to confirm that Gross opening area is 48 x 10 = 480 sf.
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