Question

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 book sold​

Answer 1

Explanation:

Let the number of sold notebooks be x.

Amount gained by selling one notebook will be 5. Hence, amount gained by selling x notebooks will be 5x.

Amount lost by selling one pen is 1. So the amount lost by selling 75 pens is 75 x 1 = 75, which can be expressed as -75.

Since the total profit is given to be 185, we can form the following equation:

$5x-75=185$

==> $5x=185+75$

==> $5x=260$

∴ $x=\frac{260}{5}=52$

Hence, he sold 52 notebooks.

Answer: 52