Answer
$\frac{1}{2}$ of the land is in Asia and Africa.
Work Step by Step
$\frac{30}{100}+\frac{20}{100}=\frac{30+20}{100}=\frac{50}{100}=\frac{50\div50}{100\div50}=\frac{1}{2}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.