What's the only room from which no one can enter or leave

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

I am an odd number. Take away a letter and I become even. What number am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?