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?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Identify the hidden meaning behind this picture?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

Solve the puzzle by telling what does below picture means.