What does this mathematical rebus means ?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

How can you make a TV, a bed, a dog, and a car liquid?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?