A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Why do you find that most of the buildings are deprived of the 13th floor?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

When 99 is considered higher than 100?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

What is the largest number you can write with just 3 digits?

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