2 bags and 10 pens together cost ₹720, whereas 8 bags and 15 pens together cost ₹1,205. The cost of 18 bags exceeds the cost of 3 pens by:

Let bag = $x$, pen = $y$

Given:
$2x + 10y = 720$
$8x + 15y = 1205$

Divide first equation by 2:
$x + 5y = 360$

Multiply by 8:
$8x + 40y = 2880$

Now subtract:
$(8x + 40y) - (8x + 15y) = 2880 - 1205$

$25y = 1675$ → $y = 67$

Put in $x + 5y = 360$:
$x + 335 = 360$ → $x = 25$

Now,
$18x - 3y = 18(25) - 3(67)$
= 450 - 201 = 249

Final Answer: ₹249