The answer is A but idk how its A... Please explain. Thanks!!
Equivalently, $\displaystyle 20- \frac{4}{5}\ge 16$ is equivalent to $\displaystyle 20\ge \frac{4}{5}x+ 16$ (add $\displaystyle \frac{4}{5}x$ to both sides) which equivalent to $\displaystyle 20- 16= 4\ge \frac{4}{5}x$ (subtract 16 from both sides).
Now multiply both sides by the positive number $\displaystyle \frac{5}{4}$:
$\displaystyle \frac{5}{4}(4)= 5\ge x$.