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?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Find the last number in the series below:

voN luJ yaM raM ---

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Count the number of triangles in the given picture.

Find the Goldfish below the given Image.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?