document.write( "Question 222057: adele went to the post office to buy stamps and postcards. she bought a total of 25 stamps some 39 cent stamps and the rest 23 cent postcards. if she paid $8.47 altogether, how many 39 cent stamps did she buy? \n" ); document.write( "
Algebra.Com's Answer #166589 by ankor@dixie-net.com(22740)\"\" \"About 
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she bought a total of 25 stamps some 39 cent stamps and the rest 23 cent postcards.
\n" ); document.write( "if she paid $8.47 altogether, how many 39 cent stamps did she buy?
\n" ); document.write( ":
\n" ); document.write( "Let s = no. of 39 cent stamps
\n" ); document.write( "and
\n" ); document.write( "Let p = no. of 23 cent stamps
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\n" ); document.write( "write an equation for each statement:
\n" ); document.write( ":
\n" ); document.write( "\"she bought a total of 25 stamps some 39 cent stamps and the rest 23 cent\"
\n" ); document.write( "s + p = 25
\n" ); document.write( "arrange for use as substitution
\n" ); document.write( "p = (25-s)
\n" ); document.write( ":
\n" ); document.write( "\"if she paid $8.47 altogether,\" let's just deal in cents
\n" ); document.write( "39s + 23p = 847
\n" ); document.write( ":
\n" ); document.write( "Replace p with (25-s) in the above equation, find s
\n" ); document.write( "39s + 23(25-s) = 847
\n" ); document.write( "39s + 575 - 23s = 847
\n" ); document.write( "39s - 23s = 847 - 575
\n" ); document.write( "16s = 272
\n" ); document.write( "s = \"272%2F16\"
\n" ); document.write( "s = 17 ea 39 cent stamps
\n" ); document.write( "and
\n" ); document.write( "25 - 17 = 8 ea 23 cent stamps
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\n" ); document.write( "Is this true?
\n" ); document.write( ".39(17) + .23(8) =
\n" ); document.write( "6.63 + 1.84 = 8.47, seems to be\r
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