what does the below rebus means?

What does this mean?

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I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Which part of London exists in France as well ?

When is the top of a mountain similar to a savings account?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?