Algebra Challenge

Question

Approximately 30% of the earths surface is land. There are about 57,250,000 square miles of land. What is the total surface area of the earth?

Answer 1

Call the surface S.

30% = .3

OF means multiply

30% of the Surface is .3S

.3S = L = 57,250,000

S = 57,250,000/.3 = about 190,833,333.33 square miles