What should come in place of the question mark (?) in the following question ?
$$\frac{9}{10}+\frac{3}{11}+\frac{7}{15}= ?$$
$$\frac{57}{67}\times\frac{32}{171}\times\frac{45}{128}=?$$
$$\frac{1}{4}$$th of $$\frac{1}{2}$$ of $$\frac{3}{4}$$th of 52000=?
$$(5863-\sqrt{2704})\times0\cdot5=?$$