1.
The cube root of .000216 is:

2.
What should come in place of both x in the equation $$\frac{x}{{\sqrt {128} }} = \frac{{\sqrt {162} }}{x}$$

3.
The least perfect square, which is divisible by each of 21, 36 and 66 is:

4.
$$\sqrt {1.5625} = ?$$

5.
If $$3\sqrt 5 + \sqrt {125} $$   = 17.88, then what will be the value of $$\sqrt {80} + 6\sqrt 5 \,\,?$$

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