Can you place six X (crosses) in below board without making three in a row in any way ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

A sundial has the fewest moving parts of any timepiece. Which has the most?

Where do fish keep their money?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

1. Where does Easter come from before Valentine's Day?

2. Do you know what is in the middle of Valentine's?

3. What did the lady bee say to the man bee on the occasion of Valentine's Day

A blonde put eyeliner on her head. Why?

If 21x = 79x, what is the value of x?