document.write( "Question 454272: sal bought some post card. if he send the same number to each of 6 friends, he will have none left over. if he sends the same to 7 friends he will have 3 left over. how many post card did sal buy? \n" ); document.write( "
Algebra.Com's Answer #311950 by richwmiller(17219)\"\" \"About 
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6x=(7y)+3
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\n" ); document.write( "\n" ); document.write( "x = 7n+4 and y = 6n+3
\n" ); document.write( "Here are three possible answers\r
\n" ); document.write( "\n" ); document.write( "where n=1
\n" ); document.write( "then x=11 y=9
\n" ); document.write( "6*11=7*9+3
\n" ); document.write( "66=63+3
\n" ); document.write( "66 total cards
\n" ); document.write( "n=2
\n" ); document.write( "then x=18 and y=15\r
\n" ); document.write( "\n" ); document.write( "6*18=(7*15)+3
\n" ); document.write( "108=105+3
\n" ); document.write( "108 total cards\r
\n" ); document.write( "\n" ); document.write( "n=3
\n" ); document.write( "x=25 y=21
\n" ); document.write( "6*25=(7*21)+3
\n" ); document.write( "150=147+3
\n" ); document.write( "150 total cards
\n" ); document.write( "etc\r
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