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?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you count the number of squares in the given picture?

What number divided by 4 is the same as that number minus 4?

Can you write down eight eights so that they add up to one thousand?

I’m tall when I’m young, and I’m short when I’m old. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

How can a man go eight days without sleep?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?