Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What is the riddle which can be asked all day with a different correct answer each time.

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What word begins and ends with an E, but has only one letter?

What goes through cities and fields, but never moves?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?