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?

Find out the number of circles in the given picture having Illusion

I know a nine-letter word having only one vowel.
Do you ?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

I have branches, but no fruit, trunk or leaves. What am I?

Which Travels Faster? Solve below famous picture riddle:

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?