I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

What can go up a chimney down, but can’t go down a chimney up?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

How many times can you subtract the number 5 from 25?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Imagine you are in a room with no windows or doors. How will you get out?

People put me on the table and cut me but do not eat me. What am I?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.