2, 3, 5, 9, 17, _ What is the next number in the sequence?

If you say my name, I will no longer exist. What am I?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

Before Mount Everest was discovered, what was the highest mountain in the world?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Find out the number of circles in the given picture having Illusion

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Decode this picture on T-Shirt and tell what it says ?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?