SOLUTION: 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?
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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? Found 2 solutions by stanbon, lynnlo:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! 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?
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Let # in each box be "x":
Equation:
6x - 39-42 = 9
6x -81 = 9
6x = 90
x = 15 (# of pens in each box)
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Cheers,
Stan H.
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You can put this solution on YOUR website! 15 pens in each box
first week sold-----39
second week sold----42
39+42=81
9 pens left on shelf +9
39+42+9=90, total of pens 90
just find a number that you can multiply & divide by and get the same answer
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