2640ft X 742Ft equal how many acres?

Answer 1

2640ft x 742ft = 1958880 sq ft

1 acre = 43560 sq ft

1958880 /43560 ~= 44.97 acres

I suspect the question was worked out backwards from 45 acres:

45 acres = 1960200 sq ft

1960200 sq ft / 2640ft = 742.5ft