# Tech Mahindra Interview Puzzle

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• You have a bucket full with 5 gallons of water.
What can you ADD to it in order to make it 3 gallons?

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• Sasha is thinking about investing 20.000 dollars in a company, which offers him a five-year plan of divident payment at the end of each year: At the end of the first year, he will get 2000 dollars. At the end of the second year, he will get 4000 dollars. At the end of the third year, he will get 6000 dollars. At the end of the fourth year, he will get 6000 dollars again, and at the end of the last year of payment plan, he will get 5000 dollars.
What is the maximum interest rate a bank could offer to Sasha, so that the investment in the company is more payable for him than making a deposit in a bank?

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• Assume there are approximately 5,000,000,000 (5 billion) people on Earth living presently.

What would you estimate to be the result, if you multiply together the number of fingers on the left hand of every person actually alive today?
(For the purpose of this exercise, thumbs count as fingers.)

If you cannot estimate the number then try to guess how long the number would be.

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