Why is 6 afraid of 7?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Find the last number in the series below:

voN luJ yaM raM ---

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

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

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag