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?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

Remove two matchsticks to make the below equation correct.