Question

Astha has pens and pencils which together are 40 in number. If she has 5 more pencils and 5 less pens, the number of pencils would have become 4 times the number of pens. Find the original number of pens with astha?

Answer 1

Step-by-step explanation:

let astha's pens be x

and pencils be y

ATQ

x+y=40: first equation

(x-5)+5 (y+5)=0

x-5+5y+25

x+5y+20=0

x+5y=-20: second equation

solve both the equation by any method

I do it with elemination method

x=25

y=15