If eleven plus two equals one, what does nine plus five equal?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What is harder to catch the faster you run?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

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

Can you make a six-letter word using the letters N, A and B ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?