document.write( "Question 272679: A rectangular airport runway is x feet long and y feet wide. If its length is to be made 100 feet longer, by how many square feet will its area be increased?\r
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\n" ); document.write( "\n" ); document.write( "(A) xy + 100y (B) xy + 100 (C) 100 ly (D) 100l (E) 100 y\r
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Algebra.Com's Answer #199381 by mananth(16946)\"\" \"About 
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A rectangular airport runway is x feet long and y feet wide. If its length is to be made 100 feet longer, by how many square feet will its area be increased?\r
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\n" ); document.write( "\n" ); document.write( "(A) xy + 100y (B) xy + 100 (C) 100 ly (D) 100l (E) 100 y\r
\n" ); document.write( "\n" ); document.write( "The area of the present runawayis x*y\r
\n" ); document.write( "\n" ); document.write( "The length is increased by 100 feet.\r
\n" ); document.write( "\n" ); document.write( "so the length will be 100 +x\r
\n" ); document.write( "\n" ); document.write( "the area will be (100+x) *y\r
\n" ); document.write( "\n" ); document.write( "Increase in area will be (100+x)*y- xy\r
\n" ); document.write( "\n" ); document.write( "100y+xy -xy\r
\n" ); document.write( "\n" ); document.write( "=100y\r
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