Question

I SWEAR DO NOT SAY 1,280! IT'S NOT AN ANSWER!

An engineer has a 40:1 scale drawing of a bridge. The dimensions of the scaled bridge deck are 42 inches by four and four fifths inches. What is the area of the actual bridge deck in square feet?

18 square feet
1,872 square feet
2,240 square feet
322,560 square feet

Answer 1

42 × 4.8 × 40² = 322,560 in.²

1 ft² = 144 in.², so

322,560 in.² = 2,240 ft²