How can you make number one disappear by adding something to it?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

How is the moon similar to a dollar?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?