Mathematics
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You have may friends. Your 1st friend asks for 1/2 a cup of water. Your 2nd friend asks for 1/4 a cup. Your 3rd friend asks for 1/8 a cup. How many cups of water do you need?
It takes 3 grandmas 3 hours to knit 3 hats. How long would it take 50 grandmas to knit 50 hats?