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.

How many times can you subtract the number 5 from 25?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

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?

What does this Rebus Picture means ?

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?