If Atul finds that he is twelfth from the right in a line of boys and fourth from the left, how many boys should be added to the line such that there are $28$ boys in the line?

How many $7$s are there in the following series which are immediately preceded by $6$ but not immediately followed by $4$?
$7, 4, 2, 7, 8, 4, 3, 6, 7, 5, 3, 5, 7, 8, 4, 3, 7, 6, 7, 2, 4, 0, 6, 7, 4, 3$

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: $8, 7, 6, 7, 8, 6, 7, 5, 6, 7, 9, 7, 6, 1, 6, 7, 7, 6, 8, 8, 6, 9, 7, 6, 8, 7$

In a row of $16$ boys,when Pramod was shifted by two places towards the left,he became $7^{th}$ from the left end. What was his earlier position from the right end of the row (in $^{th}$)?

How many $6$'s are there in the following series of numbers which are preceded by $7$ but not immediately followed by $9$?
$6, 7, 9, 5, 6, 9, 7, 6, 8, 7, 6, 7, 8, 6, 9, 4, 6, 7, 7, 6, 9, 5, 7, 6, 3$

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?