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

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What does this rebus picture identify?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you solve the rebus below?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

How can a man go eight days without sleep?