If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

What's a single-digit number with no value?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Find the missing number in the image below.

Can you make four (4) nines (9) equal 100?

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

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?

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

How is the moon similar to a dollar?