1.A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster.If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A.0
B.1/9
C.2/9
D.1/3
E.1
答案是C， how come?
2.If 1050 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?
A.424
B.433
C.440
D.449
E.467
答案C，totally have no idea~~
3.A total of $60,000 was invested for one year.But of this amount earned simple annual interest at the rate of x percent per year, and the rest earned simple annual interest at the rate of y percent per year.If the total interest earned by the $60,000 for that year was $4,080, what is the value of x?
(1)x = (3/4) y
(2)The ratio of the amount that earned interest at the rate of x percent per year to the amount that earned interest at the rate of y percent per year was 3 to 2
题目中的 the rest 是指的什么啊？答案C
4.Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?
(1)She bought $4.40 worth of stamps.
(2)She bought an equal number of $0.15 stamps and $0.29 stamps.
答案D，费解啊……
5.On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship.If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?
A.33 1/3
B.40%
C.50%
D.60%
E.66 2/3% 答案C
6.A collection of 36 cards consists of 4 sets of 9 cards each.The 9 cards in each set are numbered 1 through 9.If one card has been removed from the collection, what is the number on that card?
(1)The units digit of the sum of the numbers on the remaining 35 cards is 6.
(2)The sum of the numbers on the remaining 35 cards is 176.
答案D,虽然选对了，但是不知道第二个怎么也是对的
7.What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.
答案C，中数应该是在35%里吧？但是中数到底是2还是1呢
在此先谢谢各位了！
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