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

The numerator and denominator of a fraction are in the ratio of $2:3$. If $6$ is subtracted from the numerator,the result is a fraction that has a value $\frac{2}{3}$ of the original fraction. The numerator of the original fraction is

If $2 \frac{1}{2}$ is added to a number and the sum is multiplied by $4 \frac{1}{2}$,and $3$ is added to the product,and then dividing the sum by $1 \frac{1}{5}$,the quotient becomes $25$. What is the number?

$\frac{1}{4}$ of $\frac{1}{2}$ of $\frac{3}{4}$ of $52000 = ?$

The sum of squares of three consecutive natural numbers is $2030$. What is the middle number?

$3648.24 + 364.824 \div ? - 36.4824 = 3794.1696$