Meena went to a bank to withdraw Rs 2000.

Solution:

Let $R s . x$ be the notes of $R s .50$ and $R s .100$ notes will be $R s . y$

If Meena ask for $R s .50$ and $R s .100$ notes only, then the equation will be,

$50 x+100 y=2000$

Divide both sides by 50 then we get,

$x+2 y=40 \cdots(i)$

If Meena got 25 notes in all then the equation will be,

$x+y=25 \cdots(i i)$

By subtracting the equation $(i i)$ from $(i)$ we get,

$y=\frac{15}{1}$

$y=15$

Substituting $y=15$ in equation $(i i)$, we get

$x+y=25$

$x+15=25$

$x=25-15$

$x=10$

Therefore $x=10$ and $y=15$

Hence, Meena has 10 notes of $R s .50$ and 15 notes of $R s .100$