The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

What two things can you never eat for breakfast?

Can you find the missing piece of the Porsche?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

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?

What is harder to catch the faster you run?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

How many words can a pen with half refill write?

Can you place six X (crosses) in below board without making three in a row in any way ?