There are forty elephants and they have forty-fore heads. How can this be possible?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?