The Gobi Desert is 500,000 square miles and the Sahara Desert is 3,500,000 square miles wide.
Work Step by Step
$s=7g$ $s+g=4000000$ $7g+g=4000000 \lt=\gt 8g =4000000 \lt=\gt g =500,000 =\gt s= 3,500,000$
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