$35\%$ of a number is $91.$ What is the number?

The bar graph given below presents the number of shoes manufactured by a company on the different days of a week:

What is the total number of shoes manufactured by the company on all seven days together?

The table represents the amount of milk (in $\mathrm{litres}$) sold by two milkmen in eight days.

If $\mathrm{A}$ is the total amount (in $\mathrm{litres}$) of milk sold by milkman in $1$ in day $2$ and day $3$ and $\mathrm{B}$ is the total amount (in $\mathrm{litres}$) of milk sold by milkman $2$ in day $7$ and day $8$ then $\left(\mathrm{B}-\mathrm{A}\right)$ is equal to:

Simplify:

$100\times 10-100+2000÷100=?$

The value of $x$

$45\times x=25\% \mathrm{of} 900$ is: