Question

If the cost of 2 pencil and 3 pens is Rs 120 and the cost of 5 pencil and 2 pens is Rs 190. what is the cost of
8 pencil and 9 pens?
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Answer 1

Answer:

the cost of one pencil - $30

the cost of one pen - $20

then,

cost of 8 pencil = 8×30

= 240

cost of 9 pens = 9×20

= 180

Answer 2

Step-by-step explanation:

let cost of pencil be x

let cost of pen be y

2x+3y=120...(i)

5x+2y=190...(ii)

Now multiplying (i) with 2 and (ii) with 3

4x+6y=240

-15x+6y=570

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-11x= -330

x=330/11

x=30rs

Now putting value of x in (i)

60+3y=120

3y=120-60

y=20

So,now

cost of 8pencils=8*30=240rs

cost of 3pens=3*20=60rs