Count the number of balls in picture below:

How can you make number one disappear by adding something to it?

What has no start, end, or centre?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

How many times in a given day, minutes and hour clock comes in a straight line ?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Can you replace the question mark with the correct number in the below table sequence?

What English word has three consecutive double letters?

What does below Rebus say?

XLR8