Question

Q15: A shopkeeper gains Re 1 on each sharpner and looses 40 paisa on
each eraser. He sells 90 sharpners and some erasers losing Rs.10 in
all. How many erasers does he sell?​

Answer 1

Answer:

250

He sold 90 sharpeners, getting rs. 90

then, he lost 100 rs (90 - 100 = -10)

to lose 100 rs, he needs to sell 100 rs worth of erasers

100 rs is 10000 ps

eraser is 40 ps loss

10000/40 = 250