A pump can fill a tank in 4 hours. Another pump can fill the same tank in 3 hours, and a third pump can fill it in 4 hours. How long would it take to fill the tank with all pumps working?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

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Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?