Our product and our sum always give the same answer. Who are we?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is the next number in this series?

4,12,84,3612....

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

I am quite hot but become too cold if you remove the first two letters. What am I?

Can you replace the question mark with the correct number?

Which tank will fill first?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

When we see 2 but call 10?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?