document.write( "Question 607254: A college bookstore ordered six boxes of red pens. The store sold 39 red pens last eek and 42 red pens this week. 9 pens were left on the shelf. How many pens were in each box? \n" ); document.write( "
Algebra.Com's Answer #382541 by lynnlo(4176)\"\" \"About 
You can put this solution on YOUR website!
15 pens in each box\r
\n" ); document.write( "\n" ); document.write( "first week sold-----39
\n" ); document.write( "second week sold----42\r
\n" ); document.write( "\n" ); document.write( " 39+42=81
\n" ); document.write( " 9 pens left on shelf +9
\n" ); document.write( " 39+42+9=90, total of pens 90
\n" ); document.write( "just find a number that you can multiply & divide by and get the same answer
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