document.write( "Question 1173103: A farmer looked out his window and saw a total of 21 cows and ducks. He was bored so he counted all the legs of the cows and ducks. He counted a total of 72 legs. How many of the 21 animals were ducks? \n" ); document.write( "
Algebra.Com's Answer #798247 by josgarithmetic(39617)\"\" \"About 
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d ducks, 21-d cows\r
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\n" ); document.write( "\n" ); document.write( "\"2d%2B4%2821-d%29=72\"\r
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