document.write( "Question 154345This question is from textbook
\n" ); document.write( ": There are 40 cows and chicken in the farmyard. One quiet afternoon, Jack counted and found that there were 100 legs in all. How many cows and chickens are there? Solve this problem by writing and solving an equation. \n" ); document.write( "
Algebra.Com's Answer #113651 by Alan3354(69443)\"\" \"About 
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There are 40 cows and chicken in the farmyard. One quiet afternoon, Jack counted and found that there were 100 legs in all. How many cows and chickens are there? Solve this problem by writing and solving an equation.
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\n" ); document.write( "C = # of cows
\n" ); document.write( "K = # of chickens
\n" ); document.write( "4C + 2K = 100 (4 legs per cow, 2 per chicken)
\n" ); document.write( "C + K = 40
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\n" ); document.write( "Sub K = 40-C into eqn 1
\n" ); document.write( "4C + 2*(40-C) = 100
\n" ); document.write( "4C + 80 -2C = 100
\n" ); document.write( "2C = 20
\n" ); document.write( "C = 10
\n" ); document.write( "K = 40-C = 30
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\n" ); document.write( "10 cows and 30 chickens
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