1' = 12"
The scale; 1/4" : 1' → 1/4" : 12" → 1" : 48"
Actual large is 48 times greater than on the architectural drawing. Therefore:
2 1/2" = 2.5"; 3 3/4" = 3.75"
2.5" → 2.5" · 48 = 120" = (120 : 12)' =10'
3.75" → 3.75" · 48 = 180" = (180 : 12)' = 15'
Answer: A. 10ft by 15 ft.
