Explanation

Let's denote the cost of a geometry box as x. Since the cost of a bag is three times the cost of a geometry box, the cost of a bag is 3x.

Given that the cost of 2 bags and 3 geometry boxes is Rs.3,960, we can set up the equation:

2(3x) + 3(x) = 3960

6x + 3x = 3960

9x = 3960

Divide both sides by 9:

x = 3960 / 9

x = 440