Question
Mr Ang bought 15 boxes of pens at the price of $15 per box. He gave 25 pens to his pupils and sold the rest of the pens at 60 cents each. If he made a profit of $21, find the number of pens in each box.
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Mr Ang bought 15 boxes of pens at the price of $15 per box. He gave 25 pens to his pupils and sold the rest of the pens at 60 cents each. If he made a profit of $21, find the number of pens in each box.