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?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Move three sticks of the spiral below to form a square.

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

What's the best place to go shopping in the ocean?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Which tank will fill first?

It belongs to you, but other people use it more than you do. What is it?