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

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What two things can you never eat for breakfast?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?