Q: The four faces of a fair tetrahedral die are numbered one, two, three and four. Each time the die is rolled, three numbers are visible. If the die is rolled three times, what is the probability that the sum of all nine of the numbers showing is 21? Express your answer as a common fraction. A: 5/32
Q: If Mark drives for 4 hours at 60 miles per hour and then drives another 6 hours at 40 miles per hour, what is his average speed, in miles per hour, for the trip? A: 48
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