Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

What number should come in place of the question mark below?

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.

The dirtier I get, the whiter I look. Who am I?

You see me once in June, twice in November, and not at all in May. What am I?

I don't get anymore wetter, no matter how much rain falls on me.

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?