5. A shopkeeper earns a profit of 5 by selling one note book and incurs a loss of 1 by selling an old
pen. In a particular mo

5. A shopkeeper earns a profit of 5 by selling one note book and incurs a loss of 1 by selling an old
pen. In a particular month, the shopkeeper earns a profit of 185. If he sold 75 old pens, find the
number of the note books sold.​

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