How many times can you subtract the number two from the number fifty?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What is the word or phrase?

I am an odd number. Take away a letter and I become even. What number am I?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

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?

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?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Which tank will fill first?