Let the cost of a bag and a pen be a and b, respectively.

Then, according to the question

… (a)

… (b)

On multiplying equation (a) by and (b) by ,

We get,

… (c)

… (d)

Subtracting equation (c) from (d), we get

Hence, the cost of a bag

Substituting in equation (a),

We get,

Therefore, the cost of a pen

From the question, it’s required to find the value of

Therefore, the total cost of bag and pens .