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

I have branches, but no fruit, trunk or leaves. What am I?

What four weights can be used to balance from 1 to 30 pounds?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

Can you replace the question mark with the correct number?

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

Next Number in the Series,

5, 16, 49, 104, ?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

Spot 5 differences in two Christmas tree below:

I cannot talk, but I always reply when spoken to. What am I?