Math Riddles

Question: You have two books. One of them is upside-down and the other is rotated so the top of the book is facing you.

What is the sum of the first page in each book?

Question: Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?

Question: If you have two twins, three triplets and four quadruplets; how many people do you have?

Question: Matt's teacher asked him, "What is 3+3?" Matt answered, "8," Matt is correct. How is this possible?

Question: A man wants to have a party in thirty-one days where he will be serving his 1000 barrels of wine. The only problem is that one of his enemies poisoned one of the barrels. The poison kills any man who drinks any of the wine in about 30 days, give or take a few hours. The man has 10 plants that are also killed by the poison in 30 days and can be used to test the wine. How can identify the single poisoned barrel of wine?