A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you find a five letter word that is left with only two letters if one is removed?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

why number 8549176320 is one of a kind?

What do you call a fish without an eye?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

What English word has three consecutive double letters?