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?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

It is always ahead of me yet I can never see it. What is it?

How many times do a clock's hands overlap in a day ?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?