Question

If cost of 37 pens and 53 pencils is ₹ 320 while 37 pencils and 53 pens together cos ₹ 400 what will be cost of 2 pens?​

Answer 1

Answer:

13 rs

Step-by-step explanation:

let cost of 1 pen=x

cost of 1 pencil=y

37x+53y=320....(1)

53x+37y=400.....(2)

to eliminate y term make their multipliers equal

multiply 1 by 37 & 2 by 53

1369x+1961y=11840...(3)

2809x+1961y=21200....(4)

deduct 3 from 4

1440x=9360

x=6.5

cost of 2 pen=2x=13