Can you place six X (crosses) in below board without making three in a row in any way ?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

John was drowned by he was not wet. How?

Which city is three-fifths chick two third cat and 50% goat?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What number should come in place of the question mark below?

If it took eight men ten hours to build a wall, how long would it take four men to build it?