document.write( "Question 145296: Allen bought 56 stamps at the post office in 37 cent and 20 cent denominations. If the total cost of the stamps was $18, how many of each denomination did Allen buy? \n" ); document.write( "
Algebra.Com's Answer #105969 by Alan3354(69443)\"\" \"About 
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B=# of 37c stamps
\n" ); document.write( "L=# of 20c stamps
\n" ); document.write( "B+L = 56
\n" ); document.write( "37B+20L = 1800
\n" ); document.write( "------------
\n" ); document.write( "B=56-L
\n" ); document.write( "Substitute for B
\n" ); document.write( "37(56-L)+20L=1800
\n" ); document.write( "2072-37L+20L=1800
\n" ); document.write( "2072-17L=1800
\n" ); document.write( "-17L=-272
\n" ); document.write( "L=16
\n" ); document.write( "-----
\n" ); document.write( "B=56-L
\n" ); document.write( "B=40
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