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 $^{th}$)?

Sajith ranked thirteenth from the top and twenty-sixth from the bottom among those who have passed in the annual examination in a class. If six students have failed in the annual examination, what was the total number of students in that class?

An application was received by an inward clerk in the afternoon of a weekday. The next day,he forwarded it to the table of the senior clerk,who was on leave that day. The senior clerk,on the next day evening,put up the application to the desk officer. The desk officer studied the application and disposed of the matter on the same day,i.e.,Friday. On which day was the application received by the inward clerk?

How many $8$'s are there in the following number series which are exactly divisible by their immediately preceding and also divisible by their immediately succeeding numbers?
$8, 2, 4, 5, 1, 7, 2, 8, 4, 8, 4, 2, 2, 8, 2, 6, 9, 8, 4, 5, 4, 8, 3, 2, 8, 4, 3, 1, 8, 3$

Count each $1$ in the following sequence of numbers that is immediately followed by $2$,if $2$ is not immediately followed by $3$. How many such $1$'s are there?
$1, 2, 1, 3, 4, 5, 1, 2, 3, 5, 2, 1, 2, 6, 1, 4, 5, 1, 1, 2, 4, 1, 2, 3, 2, 1, 7, 5, 2, 1, 2, 5$

How many days will there be from $26^{th}$ January,$1988$ to $15^{th}$ May,$1988$ (both days included)?