**Solution:**

Let the number of Rs 50 notes and Rs 100 notes be *x* and *y* respectively.

According to the question,

*x *+ *y *= 25 ... **(i)**

50*x* + 100*y* = 2000 ... **(ii)**

Multiplying equation (i) by 50, we get

50*x* + 50*y* = 1250 ... **(iii)**

Subtracting equation **(iii)** from equation **(ii)**, we get

50*y* = 750

*y* = 15

Putting this value in equation **(i)**, we have *x* = 10

**Hence, Meena has 10 notes of Rs 50 and 15 notes of Rs 100.**