$\sqrt{15 \times 163 \div 5 - 89} = ?$

What is the arithmetic mean of first $20$ odd natural numbers?

The least prime number is

$2 \frac{3}{5} + 3 \frac{4}{9} + 4 \frac{3}{15} = ?$

$A$ number when divided by a certain divisor leaves a remainder of $241$. When twice the number is divided by the same divisor,the remainder is $112$. Find the divisor.

$A$ number $N$ is a positive three-digit number. If $x$ is in its hundred's place and $y$ is in its unit's place,then the number $N - 100x - y$ is always divisible by