What is always in front of you but can’t be seen?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

John was drowned by he was not wet. How?

You were playing ping pong with your friend. Suddenly the ball fell into a narrow metal pipe that was imbedded in the concrete surface of the floor one foot deep. Now you don't have any other ball and you desperately want to take it out and play. You and your friend have your shoelaces, your tennis paddle and a plastic water bottle. However, the bottle cannot fit into the pipe.

How will you take the ball out?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

You see me once in June, twice in November, and not at all in May. What am I?

Replace the question mark in the picture below.

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?