Question

22 - cost of 4 pens, 6 note books and 9 files is rs 305. Cost of 3 pens, 4 notebooks and 2 files is rs 145. What is the cost (in rs) of 5 pens, 8 notebooks and 16 files?

Answer 1

Answer:

Rs 465

Step-by-step explanation:

let x,y z is price of one pen,note book and file

Then 4x+6y+9y=305-------(1)

and 3x+4y+2z=145----------(2)

Multiply (1) by 2 we get

8x+12y+18z=610-----------(3)

Subtracting (2) from(3) we get

5x+8y+16z=610-145=465

5x+8y+16z=465

Hence cpst of 5 pens ,8 note books and 16 files

= Rs 465