Which of the following is the $CORRECT$ rationalised form of $\frac{15}{\sqrt{5}+2} ?$

The number $0.121212 \ldots$ in the form $\frac{p}{q}$ is equal to

$A$ pineapple costs $Rs. 7$ each. $A$ watermelon costs $Rs. 5$ each. $X$ spends $Rs. 38$ on these fruits. The number of watermelons purchased is

What approximate value will come in place of the question mark $(?)$ in the given equation? (You are not expected to calculate the exact value)
$\frac{1810}{24.05} \times 7.95 + 11.02 \times 18.88 = ? - 306$

$337.62 + 8.591 + 34.4 = ?$

The value of $\left\{\frac{3 \sqrt{2}}{(\sqrt{3}+\sqrt{6})}-\frac{4 \sqrt{3}}{(\sqrt{6}+\sqrt{2})}+\frac{\sqrt{6}}{(\sqrt{2}+\sqrt{3})}\right\}$ is: