How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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?

What does this rebus means ?

What do you see in the image below

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Why is the longest human nose just 11 inches?

The answer I give is yes, but what I mean is no. What was the question?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)