document.write( "Question 1107786: U.S. five cent coins are made from a combination of nickel and copper. For every 1 lb of nickel, 3 lb of copper are used. How many pounds of cooper would be needed to make 560 lb of five cent coins? \n" ); document.write( "
Algebra.Com's Answer #722822 by addingup(3677)\"\" \"About 
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c = 3n
\n" ); document.write( "n + c = 560
\n" ); document.write( "n + 3n = 560
\n" ); document.write( "4n = 560
\n" ); document.write( "n = 140
\n" ); document.write( "He will need 140 Lbs of nickel and 140(3) = 420 Lbs of copper
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