WBCS 2021 Mains (General Studies Paper-IV) Prev. Yr. Paper (24-May-2022)

The area of an equilateral triangle is $400\sqrt{3}\text{sq. m}$. Its perimeter is:

Direction: Choose the set of numbers from the four alternatives that is similar to the given set.
Given set: $(21,51,15)$

If $x=7-4\sqrt{3}$, then $\sqrt{x}+\frac{1}{\sqrt{x}}=\text{?}$

The average age of three boys is $15$ years and their ages are in the proportion $3:5:7$. What is the age in years of the youngest boy?

If the product of two successive positive integers is $7482$, which is the greatest integer?