81 x 9 = 801. What must you do to make the this equation true?

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

Decode below rebus
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Can you name an animal whose killing cannot be performed without spilling your own blood?

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?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

In the image below, can you find the value of an angle(y)

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)