If the $25^{th}$ of August in a year is Thursday,the number of Mondays in that month is

$M$ is older than $R$. $Q$ is younger than $R$ and $N$. $N$ is not as old as $M$. Who among $M, N, R$,and $Q$ is the oldest?

Kailash remembers that his brother Deepak's birthday falls after $20^{th}$ May but before $28^{th}$ May,while Geeta remembers that Deepak's birthday falls before $22^{nd}$ May but after $12^{th}$ May. On what date does Deepak's birthday fall?

There are $20$ people working in an office. The first group of $5$ works between $8:00 \,A.M.$ and $2:00 \,P.M.$ The second group of $10$ works between $10:00 \,A.M.$ and $4:00 \,P.M.$ And the third group of $5$ works between $12$ noon and $6:00 \,P.M.$ There are $3$ computers in the office which all the employees frequently use. During which of the following hours are the computers likely to be used most?

In the following series of numbers,how many times have the figures $9, 1,$ and $8$ appeared together,with $1$ being in the middle and $9$ and $8$ being on either side of $1$ (i.e.,the sequence $9, 1, 8$ or $8, 1, 9$)?
$2, 1, 9, 8, 1, 9, 8, 3, 7, 1, 9, 7, 8, 1, 2, 9, 1, 9, 8, 1, 8, 2, 1, 2$

In a row of girls, Rita and Monika occupy the ninth place from the right end and tenth place from the left end, respectively. If they interchange their places, then Rita and Monika occupy the eighteenth place from the left end. How many girls are there in the row?