$525 \times 24 \div 8 + 25 = (?)^2$

$(8.5 \times 8.5 + 93.5 + 5.5 \times 5.5)^{1/2}$ is equal to ...........

$A$ number is of two digits. The position of digits is interchanged and the new number is added to the original number. The resultant number will always be divisible by

$9999 + 8888 + 777 + ? = 19700$

Which fraction among $\frac{3}{7}, \frac{5}{11}$,and $\frac{6}{13}$ is the largest?

$\sqrt{8 \times 220 \div 11 + 85 - 20} = ?$