Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

What have one eye but still cannot see?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

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

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

I can be cracked, made, told, and played. What am I?

What seven-letter word has hundreds of letters in it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

If 21x = 79x, what is the value of x?