Count the squares in the matchstick puzzle below?

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?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

The dirtier I get, the whiter I look. Who am I?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Which five letter word can be added at the end of below word to form a
valid word?

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How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.