Step-by-step explanation:
1 ft = 12 in
so, from 1 inch to 12 inches (1 ft) we have the scale factor 12.
from 1 ft to 2 ft we have an additional factor 2.
so, in total we have the scaling factor 2×12 = 24.
6 in × 5 in on the blueprint is then
6×24 × 5×24 = 144 in × 120 in = 12 ft × 10 ft
in reality.