document.write( "Question 238331: Maria paid 80 cents each for some packages of cards. She sold all but 18 packages for $2 each, making a profit of $48. How many packages of cards did she buy? \n" ); document.write( "
Algebra.Com's Answer #175132 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Maria paid 80 cents each for some packages of cards.
\n" ); document.write( " She sold all but 18 packages for $2 each, making a profit of $48.
\n" ); document.write( " How many packages of cards did she buy?
\n" ); document.write( ":
\n" ); document.write( "Let x = no. of pkg of cards bought
\n" ); document.write( ":
\n" ); document.write( "Cost of the cards
\n" ); document.write( "c = .80x
\n" ); document.write( ":
\n" ); document.write( "Revenue from sale of cards
\n" ); document.write( "r = 2(x-18)
\n" ); document.write( ":
\n" ); document.write( " rev - cost = profit
\n" ); document.write( "2(x-18) - .8x = 48
\n" ); document.write( ":
\n" ); document.write( "2x - 36 - .8x = 48
\n" ); document.write( ":
\n" ); document.write( "2x - .8x = 48 + 36
\n" ); document.write( ":
\n" ); document.write( "1.2x = 84
\n" ); document.write( "x = \"84%2F1.2\"
\n" ); document.write( "x = 70 pkg of cards
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Is this true?
\n" ); document.write( "2(52) - .8(70)
\n" ); document.write( "104 - 56 = 48 \n" ); document.write( "
\n" );