Question

9 pens and 5 pencil cost rupees 320 and 7 pens and 8 pencils cost rupees 299 find the unit price for each pen and pencil​

Answer 1

Answer:

Cost of pen is 29

Cost of pencil is 12

Step-by-step explanation:

Let us consider cost of 1 pen is X

And cost of one pencil is Y

So;

From statement 1

9X+5Y=320

From statement 2

7X+8Y=299

By elimination method

Statement 1*7 - statement 2*9

63X +35Y = 2240

- 63X-72Y = - 2691

Ans: - 37Y = - 451

Y=12 (approx) [statement 3]

Substitute statement 3 in 1

X=29 (approx)

Hence the unit price of 1 pencil and pen is 29 and 12..