I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What number divided by 4 is the same as that number minus 4?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What is the next shape from answers A, B, C, and D figure?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?