There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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

Replace the question mark with the correct number below.

Prove that twice of ten is the same as twice of eleven.

What is the coolest letter in the alphabet?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Spot what is wrong here in below Picture?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

Forwards I am heavy, backward I am not. What am I?