WBCS Mains 2020 Official Paper-VI

The difference between a two-digit number and the number obtained by interchanging the digits is $36$. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is $1:2$?

Ankit is the son of Zubin. Manju is the daughter of Anil. Sheela is the mother of Manju. Mohan is the brother of Manju. How is Mohan related to Sheela?

A sum of $\text{Rs. }312$ was divided among $100$ boys and girls in such a way that each boy gets $\text{Rs. }3.60$ and each girl $\text{Rs. }2.40$. The number of girls is:

A two-digit number is such that the product of the digits is $8$. When $18$ is added to the number, then the digits are reversed. The number is:

How many numbers between $400$ and $600$ begin with or end with the digit $5$?