\(\sqrt {\frac{{32.4}}{?}} \) = 2 Which will come in place of question mark ?

A 2.1

B 3.1

C 8.1

D 4.1

Correct Answer: Option C

Solution: \(\sqrt {\frac{{32.4}}{x}} = 2\) => 32.4/x = 4 => 4x = 32.4 => x = 32.4/4 x = 8.1