Count the number of triangles in the picture below:

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What is next number in the pattern below:

131 517 192 123 ?

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?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

Can you find out the remainder when 3^300 is divided by 5?

Can you spot the hidden girl in the picture below?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?