Mohan is older than Prabir,Suresh is younger than Prabir. Mihir is older than Suresh but younger than Prabir. Who among the four is the youngest?

If $18^{th}$ February,$1997$ falls on Tuesday,then what will be the day on $18^{th}$ February,$1999$?

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?

Aruna ranks twelfth in a class of forty-six. What will be her rank from the last?

How many $7$'s are there in the following series which are preceded by $6$ but not preceded by $8$ (i.e.,the sequence $6, 7$ where $6$ is not immediately preceded by $8$)?
Series: $8, 7, 6, 7, 8, 6, 7, 5, 6, 7, 9, 7, 6, 1, 6, 7, 7, 6, 8, 8, 6, 9, 7, 6, 8, 7$

Akshay is $16^{th}$ from the left end in a row of boys and Vijay is $18^{th}$ from the right end. Avinash is $11^{th}$ from Akshay towards the right end and $3^{rd}$ from Vijay towards the right end. How many boys are there in the row?