It belongs to you, but other people use it more than you do. What is it?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Why is Saturday stronger than Monday?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?