Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What happened when the wheel was invented?

What Does this text mean:

important=important

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

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

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?