When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which is faster, Heat or Cold ? Explain.

The more you take me, the more you leave me behind.
Who Am I?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

Count the number of triangles in the picture below:

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What is next number in the pattern below:

131 517 192 123 ?

Can you start the fire using two pieces of wood?

What is common among 11, 69, and 88?