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?

Replace the question mark with the correct number in below Picture:

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Solve the equation in the image by looking at the pattern closely.

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

What does this mean?

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John is the son of Jacob.
So,
Jacob is the_____of John's father?