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A water tank is filled in this way 256,128,64,....th parts in every hour. then in how many hours the tank may be filled.?

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there are two friends peter and paul.Peter age is twice as old as paul when peter was as old as paul is now. sum of the present age of peter and paul is 35. What is the present age of the peter is? A bag contains 20 yellow balls, 10 green balls, 5 white balls, 8 black balls, and 1 red ball. How many minimum balls one should pick out so that to make sure the he gets at least 2 balls of same color.