If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

How can a man go eight days without sleep?

Three logicians went to bar for having a drink. The bar person asks the logicians "Do they all want to have the drink?". The first logician replied, " I don't know". The second logician replied, " I don't know". What is the reply of the last logician?

What is more useful when it is broken?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

Count the number of triangles in the picture below:

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

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?