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

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

There is something which you can be arrested for attempting but not for successfully completing.

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927