$36 + 451 \div 11$

$5.6 \times 12.5 \div 0.5 + 15.5 = ? + 49.5$

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?

The value of $x$ in the following equation is
$0.3+0.6+0.7+0.8=x$

$42 \%$ of a number is $357$. What is $63 \%$ of that number?

If $m$ and $n$ are positive integers and $(m-n)$ is an even number,then $(m^{2}-n^{2})$ will be always divisible by