What does this mathematical rebus means ?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Why did the Girl throw the butter out of the window?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What word does this rebus represent?

meta meta
meta meta

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

What country can make you shiver?

Which five letter word can be added at the end of below word to form a
valid word?

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What does this rebus puzzle means ?