Question

Cost of 4 pens and 4 boxes of pencils is Rs 100 . Three times the cost of a pen is Rs 15 more than of a pencil box. find the cost of a pen and a pencil

Answer 1

Answer:

1 pen = 2.5 rupees

1 box of pencil = 22.5 rupees

Step-by-step explanation:

Lets take pen as =x

Lets take pencil box as = 3x + 15

according to question

4 pens = 4x

4 pencil box = 4*3x+15

Equation

4x+4(3x+15) = 100

= 4x + 12x + 60 = 100

16x = 100-60

16x = 40

X = 40 / 16

X = 2.5 rupees

4 pens = 2.5*4

= 10.0 rupees.

4 boxes of pencils = 4(3*2.5+15)

=12*2.5+60

= 30.0+60

=90