Question

The cost of a copy is Rs. 5 ¾. and that of a book is Rs.15 ⅚. Which cost more a copy or a book ? and how much?

Answer 1

Let the cost of an exercise book be Rs.x

Let the cost of a pencil be Rs.y

2x+3y=17 Blue line

3x+4y=24 Red line

Corresponding graph is shown in the attached figure. From the graph, it can be seen the solution is x=4,y=3.

Hence, the cost of exercise book is Rs.4 and that of a pencil is Rs.3.