Be active and find the killer in the picture Riddle below.

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

What's the only room from which no one can enter or leave

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Who has married many women but was never married?

What word does this rebus represent?

meta meta
meta meta

What's a single-digit number with no value?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.