What number when divided in half becomes zero?

What is the next number?

77, 49, 36, 18 ?

Count the squares in the matchstick puzzle below?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What does the rebus below mean?

TEN BADTION

What is the longest word in the dictionary?

What does an Island and the letter T have in common?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

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?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?