The cost of 2 pens and 3 books are 40 rupees the cost of 2 pens and 5 books are 60 ruppes then what is the cost of a pen ? what is the cost for the book ?
Answers
Answered by
1
Step-by-step explanation:
let the no.of pens be x
and that of books be y
then,
2x+3y=40------------(1)
2x+5y=60------------(2)
by elimination method,
2x+3y=40
-2x-5y= -60
———————
-2y = -20
y = -20/-2
y = 20/2
y = 10
substituting y in x
2x + 3*10=40
2x +30=40
2x = 40-30
2x = 10
x = 10/2
x = 5
Similar questions