Question

antartica comprises about 10.5% of the total land area on earth. antartica has surface area of about 5,400,000 square miles. what is the total land area on earth?

Answer 1

5 400 000 sqm ~ 10,5%
5 400 000sqm/10.5 ~1%
5 400 000sqm/10.5 *100 ~ 100%

so you multiply the area with 100/10.5 and you should get the total amount

Answer 2

5,400,000 / 0.105
= 51,428,571.43 square miles

Answer 3

about 51,400,000 sq miles