Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

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

Identify the 10 differences between the two given pictures.

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Which number should replace the question mark?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?