Cristina was born in 1888. She just had her 30th birthday today how did that happen?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I have teeth but i don't bite. Who Am I ?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

81 x 9 = 801. What must you do to make the this equation true?