Two pens and three pencils cost Rs 86.FOUR PENS AND A PENCIL COST Rs. 112. fIND THE COST OF A PEN AND THAT OF A PENCIL RESPECTIVELY?

2pens + 3 pencils = 86.....(1)

4pens + pencil = 112..........(2)

Multiply equ(1) by 2

4pens + 6pencils = 172.....(3)

Now subtract eq(3) from eq(2)

      4pens + pencil = 112

    -4pens - 6pencils = -172

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        0    - 5pencils = -60

pencils = -60/-5 = 12

Put the cost of a pencil in eq(2)

4pens + 12 = 112

pens = 100/4 = 25

therfore,

cost of a pen =$25

cost of a pencil = $12