What word begins and ends with an E, but has only one letter?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

Which is faster, Heat or Cold ? Explain.

How many times in a given day, minutes and hour clock comes in a straight line ?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

I have teeth but i don't bite. Who Am I ?

Find the number of squares in the below picture

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you count the number of quadrilaterals in the picture below?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?