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How would you answer these?

Google Interview questions

15 Google Interview Questions That Will Make You Feel Stupid (GOOG)

1. How many golf balls can fit in a school bus?
2. How much should you charge to wash all the windows in Seattle?
3. In a country in which people only want boys, every family continues to have children until they have a boy.

If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?
5. How many piano tuners are there in the entire world?
6. Why are manhole covers round?
7. Design an evacuation plan for San Francisco.
8. How many times a day do a clock's hands overlap?
9. Explain the significance of "dead beef".
10. A man pushed his car to a hotel and lost his fortune. What happened?
11.You need to check that your friend, Bob, has your correct phone number…, but you cannot ask him directly. You must write the question on a card which and give it to Eve who will take the card to Bob and return the answer to you. What must you write on the card, besides the question, to ensure Bob can encode the message so that Eve cannot read your phone number?
12.You have eight balls all of the same size…
…7 of them weigh the same, and one of them weighs slightly more. How can you find the ball that is heavier by using a balance and only two weighings?
13.Explain a database in three sentences to your eight-year-old nephew.