$\frac{6}{5}$ of $\frac{3}{4}$ of $\frac{1}{2}$ of $? = 3600$

$(21.98)^{2} - (25.02)^{2} + (13.03)^{2} = ?$

The product of two numbers is $120$. The sum of their squares is $289$. The sum of the two numbers is

Which one is the largest among the fractions $\frac{5}{113}, \frac{7}{120}, \frac{13}{145}$ and $\frac{17}{160}$?

The quotient arising from a division of a number by $62$ is $463$ and the remainder is $60$. What is the number?

$A$ certain two-digit number is three times the sum of its digits. If $45$ is added to the number,the digits are reversed. Find the number.