What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Before Mount Everest was discovered, what was the highest mountain in the world?

Find the hidden tiger in the given optical illusion ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you write down eight eights so that they add up to one thousand?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

What two things can you never eat for breakfast?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?