If a number is decreased by $4$ and divided by $6,$ the result is $8.$ What would be the result if $2$ is subtracted from the number and then it is divided by $5$ ?

$(\sqrt{9})^{3} \times (\sqrt{81})^{5} \div 27^{2} = 3^{?}$

The numerator of a fraction is the product of two numbers. One of the numbers is greater than the other by $2$. The greater number is smaller than the denominator $D = 7+c$ (where $c > -7$ is a constant). If the fraction is $f(x) = \frac{(x-2)x}{x+k}$ (where $x$ is the greater number),find the minimum value of the fraction.

The sum of two numbers is $100$ and their difference is $37$. The difference of their squares is

If $35 \%$ of a number is $182$,then what is $150 \%$ of that number?

If $x[-2\{-4(-a)\}]+5[-2\{-2(-a)\}]=4 a,$ then $x=$