document.write( "Question 1020454: The area of the earth's surface is about 530 km square,approximately seven tenth. of the earth's surface is water. A.What fraction is land ?B.how many square kilometers of the earth's surface is land? \n" ); document.write( "
Algebra.Com's Answer #636334 by josmiceli(19441)\"\" \"About 
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If \"+7%2F10+\" is water, \"+1+-+7%2F10+=+3%2F10+\"
\n" ); document.write( "\"+3%2F10+\" of the surface is land
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\n" ); document.write( "\"+530%2A%283%2F10%29+=+159+\"
\n" ); document.write( "159 km2 is land
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