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?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

John's five friends Rachel, Jacob, Phoebe, Joey and Chandler live on the same road.

Rachel lives in the house: A, Jacob lives in the house: B, Phoebe lives in the house: C, Joey lives in the house:D, Chandler lives in the house: E

Mathematically
B*C*D = 1260
B + C + D = 2E
2A = E

The road numbers run from 2 to 222.

Can you tell me the house number of each of John's friends?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Count the number of triangles in the picture below:

What can go up a chimney down, but can’t go down a chimney up?