What will come in the place of question mark $(?)$ in the following expression?
$561 \div 35.05 \times 19.99 = ?$

Which of the following fractions is less than $\frac{7}{8}$ and greater than $\frac{1}{3} ?$

$12.1212 + 17.0005 - 9.1102 = ?$

The value of $3+\frac{1}{\sqrt{3}}+\frac{1}{3+\sqrt{3}}+\frac{1}{\sqrt{3}-3}$ is

What is the value of $5 \frac{1}{2} + 7 \frac{1}{2} + 11 \frac{1}{2}$?

$A$ tin of oil was $\frac{4}{5}$ full when $6$ bottles of oil were taken out. Again,$4$ bottles of oil were poured into it,and it became $\frac{3}{4}$ full. How many bottles of oil can the tin contain?