If you say my name, I will no longer exist. What am I?

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

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

You can hear me, but you can't touch or see me.

What am I?

What do you answer even though it never asks you questions?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?