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

A boy recorded the weight of some of his friends as $32\text{kg}$, $30\text{kg}$, $40\text{kg}$, $65\text{kg}$, $54\text{kg}$, $38\text{kg}$, $36\text{kg}$, $45\text{kg}$, $50\text{kg}$, $52\text{kg}$, $40\text{kg}$. What is the median?

If $\frac{x}{y}=\frac{a+2}{a-2}$, then find the value of $\frac{x^2-y^2}{x^2+y^2}$.

In a two digit number, the unit's digit exceeds ten's digit by $2$ and the product of the sum of the digits and the number itself is $144$, then what is the number?

Direction: Refer to the Venn diagram in the given image image_b95340.png showing the number of Bengali students of age 18 attending certain online courses during complete lockdown:
The square represents the students who are learning Spanish, the triangle is for those who are learning music, and the circle is for those who are learning photography. Study the diagram and answer the question.



What approximately is the percentage of students who are learning one thing only?

The sum of the first 16 terms of the A.P.: 10, 6, 2, ... is