57. Exemplar problems XXIII

The cost of \(4\) pens and \(4\) pencil boxes is \(Rs.100\). Three times the cost of a pen is \(Rs.15\) more than the cost of a pencil box. Form the pair of linear equations for the above situation. Find the cost of a pen and a pencil box.

 

 

The cost of a pen is \(Rs.\).

 

The cost of a pencil box is \(Rs.\).