Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What is black when you buy it, red when you use it, and gray when you throw it away?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I have a sore throat and a severe headache. I have four tablets with me that are identical to each other and they do not have any cover on them. There is no way I can identify which tablet serves what purpose. The only thing that I know is that two of these four tablets are for the throat and the remaining two are for the headache. To treat my condition, I must take 1 of each. What will I do now?

Out of four images which one is the odd one out?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Take away the whole and some still remain. What is it?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?