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