In the lab, maria has two solutions that contain alcohol and is mixing them with each other. she uses 3 times as much solution a as solution b. solution a is 17% alcohol and solution b is 20% alcohol. how many milliliters of solution b does she use, if the resulting mixture has 213 milliliters of pure alcohol?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?