Solve the following.
$$\sqrt{\frac{225}{729}} - \sqrt{\frac{25}{144}} - \sqrt{\frac{16}{81}}$$​= ?

Correct option is A

​$$\sqrt{\frac{225}{729}} - \sqrt{\frac{25}{144}} - \sqrt{\frac{16}{81}}\\\ \\ \frac{15}{27} - \frac{5}{12} - \frac{4}{9}\\\ \\\frac{5}{9} - \frac{5}{12} - \frac{4}{9}\\\text {Find a common denominator (LCM of 9 and 12 is 36)}= \frac{20}{36} - \frac{15}{36} - \frac{16}{36} \\= \frac{20 - 15 - 16}{36}\\\ \\= \frac{-11}{36}\\\ \\\text{Therefore, the value of the given expression is } \frac{-11}{36}.\\$$​​