In a class of $20$ students, Alisha's rank is $15^{th}$ from the top. Manav is $4$ ranks above Alisha. What is Manav's rank from the bottom (in $^{th}$)?

In the following sequence of instructions,$1$ stands for Run,$2$ stands for Stop,$3$ stands for Go,$4$ stands for Sit and $5$ stands for Wait. If the sequence were continued,which instruction will come next?
$4, 4, 5, 4, 5, 3, 4, 5, 3, 1, 4, 5, 3, 1, 2, 4, 5, 4, 5, 3, 4, 5, 3$

Rahul ranked ninth from the top and thirty-eighth from the bottom in a class. How many students are there in the class?

How many numbers from $1$ to $100$ are there,each of which is not only exactly divisible by $4$ but also has $4$ as a digit?

Among $P,$ $Q,$ $R,$ $S,$ and $T,$ $S$ is older than $R$ but not as old as $T.$ $Q$ is older than only $P.$ Who among them is the youngest?

Manoj and Sachin are ranked seventh and eleventh respectively from the top in a class of $31$ students. What will be their respective ranks from the bottom in the class?