If it took eight men ten hours to build a wall, how long would it take four men to build it?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

What word begins and ends with an E, but has only one letter?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

When 99 is considered higher than 100?

When can we add 2 to 11 and get 1 as the correct answer?

Count the Triangle in the figure given below: