Question

a shopkeeper gain rs 1 on each pen and loses 40 paise on each pencil he sells 45 pens and some pencil losing rs 5 in All how many pencil does he sell

Answer 1

Let the total no of pencils he sell be x
So total profit made on pens=45rs
Total loss made on pencils=40x/100
Total loss at all=5
-40x/100+45=5
-2x/5+45=5
(225-2x)/5=5
225-2x=25
-2x=25-225
2x=200
x=100pencils