Quantitative Question:
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Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40mins. If all of them work together, find the time taken to fill the tank?

Answer:

17 1/7 mins.

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20% of a 6 litre solution and 60% of 4 litre solution are mixed. What percentage of the mixture of solution?Three cards are drawn at random from an ordinary pack of cards. Find the probability that they will consist of a king, a queen and an ace?