SOLUTION: 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

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.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = number of pen boxes = 15
y = number of pencil boxes = ?
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x + y = 50
15 + y = 50
y = 50 - 15
y = 35
y = number of pencil boxes = 35
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total cost = 3x + 2y
total cost = 3*15 + 2*35
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answer:
total cost = $115
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