Question

6 ③ The cost of 4 pens and 4 pencils is 100 R.
three times the cost of
pen
is 15 s. more
than the cost of a pencil. Find the cost of
a pen &
a pencil .​

Answer 1

Answer:

Step-by-step explanation:

Let the cost of a pen and a pencil be x and y respectively.

4x+4y=100

x+y=25    ...(1)

3x=y+15

3x−y=15    ...(2)

Adding (1) and (2), we get

4x=40

x=10

Substitute x=10 in equation (1) to get y=15.