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using FIVE ZEROS and any of the mathematical opeartions u can use . One should get Answer 120. can u slove this puzzle ?

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TCS Other Question

name the word which contain all the vowels .Doesn't repeat the same letter again? A tank is full of water. A drain pipe which can empty the full tank in 60 minutes is opened. 18 minutes later another pipe which can fill the empty tank in 30 minutes is opened. After how much time, in total is the tank full again(in minutes)?