What number comes next in this sequence:
7 8 5 5 3 4 4 _

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

During which month do people sleep the least?

Count the number of lines in the image below ?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

Which Travels Faster? Solve below famous picture riddle:

When it's bad luck to meet a black cat?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

What does below pictogram mean?