Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Count the number of triangles in the given picture.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Can you name some countries which do not have the alphabet 'A' in them?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I have eight fingers and two thumbs but I do not live. What Am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.