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600-650   題數(shù)：688
A certain junior class has 1,000 students and a certain senior class has 800 students. Among these students, there are 60 sibling pairs, each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?
Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. If the length of the longest piece of rope is 14 centimeters more than 4 times the length of the shortest piece of rope, what is the maximum possible length, in centimeters, of the longest piece of rope?
A certain taxi company charges $3.10 for the first 1/5 of a mile plus $0.40 for each additional 1/5 of a mile. What would this company charge for a taxi ride that was 8 miles long?
A flower arrangement consists of 30 roses, each of which is either white or red. If a rose is to be selected at random from the flower arrangement, the probability that the rose selected will be white is twice the probability that it will be red. How many white roses are in the flower arrangement?
A certain company had an annual profit of $15 million in 1998 and an annual profit of $20 million in 1999. In 2000 the company had an annual loss of $5 million. What was the company's average (arithmetic mean) annual profit for the 3 years?
【OG20-P146-3題】During a trip that they took together ,Carmen ,Juan ,Maria ,and Rafael drove an average (arithmetic mean )of 80 miles each. Carmen drove 72 miles ,Juan drove 78 miles ,and Maria drove 83 miles .How may miles did Rafael drive ?
3 teaspoons = 1 tablespoon，4 tablespoons = 1/4 cup, According to the information above, how many teaspoons are equal to 3/8 cup?
The y-intercept of a line L is 4. If the slope of L is negative, which of the following could be the x-intercept of L ?I -1II 0III 6
The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P =
In a certain board game, a stack of 48 cards, 8 of which represent shares of stock, are shuffled and then placed face down. If the first 2 cards selected do not represent shares of stock, what is the probability that the third card selected will represent a share of stock?
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