What is the next number in this series?

4,12,84,3612....

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Which word does the below Plexor means ?

How many times in a given day, minutes and hour clock comes in a straight line ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?