Question
Mr Ong bought 25 boxes of pens at the price of $9 per box. He gave 50 pens to his students and sold the rest of the pens at 40 cents each. If he made a profit of $45, find the number of pens in each box.
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Mr Ong bought 25 boxes of pens at the price of $9 per box. He gave 50 pens to his students and sold the rest of the pens at 40 cents each. If he made a profit of $45, find the number of pens in each box.