Question

The cost of 5 pens and 8 pencils is rupees 120, while the cost of 8 pens and 5 pencils is rupess 153. Find the cost of 1 pen and that of 1 pencils.

Answer 1

Answer:

Let the cost of one pen is Rs.x and cost of one pencil is Rs.y, then

As per statement

5x+8y=120...(1)

8x+5y=153...(2)

Adding both the equations, we get

13x+13y=273

x+y=21....(3)

On subtracting (1) from (2),

3x−3y=33

x−y=11...(iv)

Again

Adding (3) and (iv).

2x=32 or x=16

On subtracting

2y=10 or y=5

Answer:

Cost of pen =Rs.16

and cost of pencil =Rs.5

Answer 2

Answer:

Cost of one pen is rupees 16 and cost of one pencile is rupees 5...