document.write( "Question 457483: Purchase regular .37 stamps and also pick up some .40 stamps the number of .40 stamps was 8 fewer than the regular stamps 19.90 was spent. How many of each each stamp did he buy? \n" ); document.write( "

Algebra.Com's Answer #313905 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = number of .37 stamps
\n" ); document.write( "Let $\"+b+\"$ = number of .40 stamps
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+b+=+a+-+8+\"$
\n" ); document.write( "(2) $\"+37a+%2B+40b+=+1990+\"$ ( in cents)
\n" ); document.write( "----------------------
\n" ); document.write( "(1) $\"+a+-+b+=+8+\"$
\n" ); document.write( "Multiply both sides of (1) by $\"37\"$
\n" ); document.write( "and subtract (1) from (2)
\n" ); document.write( "(2) $\"+37a+%2B+40b+=+1990+\"$
\n" ); document.write( "(1) $\"-37a+%2B+37b+=+-296+\"$
\n" ); document.write( " $\"++77b+=+1694+\"$
\n" ); document.write( " $\"+b+=+22+\"$
\n" ); document.write( " $\"+a+-+b+=+8+\"$
\n" ); document.write( " $\"+a+-+22+=+8+\"$
\n" ); document.write( " $\"+a+=+30+\"$
\n" ); document.write( "He bought 30 .37 stamps and 22 .40 stamps \n" ); document.write( "

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