Can you name some countries which do not have the alphabet 'A' in them?

What is the longest word in the dictionary?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

How can one talk without saying a single word?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I cannot talk, but I always reply when spoken to. What am I?

Replace the question mark with the correct number below.