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The answer to the question on page 65 12 of the first volume of the sixth grade mathematics of Jiangsu Education Press is 2010-10-17
Europe: 900× 10/9= 1000 (ten thousand square kilometers) North America: 1000÷ 5/ 12=2400 (ten thousand square kilometers).

Asia: 2400 ÷ 6/1= 4400 (ten thousand square kilometers) Antarctica: 2400÷ 12/7= 1400 (ten thousand square kilometers).

South America: 2400× 3/4= 1800 (ten thousand square kilometers) Africa: 1800÷ 3/5=3000 (ten thousand square kilometers).

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