document.write( "Question 924360: You are purchasing pens and pencils to be sold at the school store. You need a total of 50 boxes of pens and pencils. The pens cost $3 per box and the pencils cost $2 per box. Find the total cost of the pens and pencils when you purchase 15 boxes of pens. \n" ); document.write( "
Algebra.Com's Answer #560781 by TimothyLamb(4379)\"\" \"About 
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x = number of pen boxes = 15
\n" ); document.write( "y = number of pencil boxes = ?
\n" ); document.write( "---
\n" ); document.write( "x + y = 50
\n" ); document.write( "15 + y = 50
\n" ); document.write( "y = 50 - 15
\n" ); document.write( "y = 35
\n" ); document.write( "y = number of pencil boxes = 35
\n" ); document.write( "---
\n" ); document.write( "total cost = 3x + 2y
\n" ); document.write( "total cost = 3*15 + 2*35
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "total cost = $115
\n" ); document.write( "---
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