$149.9 \%$ of $149.9 + 149.9 = ?$

Find the greatest fraction among the fractions $\frac{17}{18}, \frac{21}{22}, \frac{26}{27}$ and $\frac{36}{37}$?

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 $5$ ?

$\frac{(0.188+0.077)^{2}+(0.188-0.077)^{2}}{0.188 \times 0.188+0.077 \times 0.077} = ?$

The product of two numbers is $120$ and the sum of their squares is $289$. The sum of the numbers is

$140 \%$ of $56 + 56 \%$ of $140 = ?$