5-[4-{3-(3-3-6)}] is equal to:

What approximate value should come in place of the question mark(?) in the following question?
5223÷36×0.93=?

$$3\sqrt{ {72.9\over0.4096}}$$ is equal to : 

Simplification the following equations shown below

What approximate value should come at place of the question mark(?) in the following question?

Direction : What value should come in the place of question mark (?) in the following questions?

125% of 2440 – 75% of 1856 = ?

Simplify the following equation.
$$ {(100)}^{1\over2}.{(0.001)}^{1\over3}-{(0.0016)}^{1\over4}.{3}^{0}+({5\over4})^{-1} $$