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

By what process could you make a 'Tea-Table' into food?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Using eight eights and addition only, can you make 1000?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

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

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.