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3.How many different prime numbers are factors of the positive integer n ? B
(1) Four different prime numbers are factors of 2n.
(2) Four different prime numbers are factors of n2.
8.If n and m are positive integers, what is the remainder when 3^(4n + 2 + m) is divided by 10 ? B
(1) n = 2 (2) m = 1
23.At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French
also study Japanese, do more students at the school study French than Japanese? B
(1) 16 students at the school study both French and Japanese.
(2) 10 percent of the students at the school who study Japanese also study French
34.During an experiment, some water was removed from each of 6 water tanks. If the standard deviation of the volumes of
water in the tanks at the beginning of the experiment was 10 gallons, what was the standard deviation of the volumes of
water in the tanks at the end of the experiment? A
(1) For each tank, 30 percent of the volume of water that was in the tank at the beginning of the experiment was removed
during the experiment.
(2) The average (arithmetic mean) volume of water in the tanks at the end of the experiment was 63 gallons.
55.Malik's recipe for 4 servings of a certain dish requires 1.5cups of pasta. According to this recipe, what is the number of
cups of pasta that Malik will use the next time he prepares this dish? C
(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.
64.Are at least 10 percent of the people in Country X who are 65 years old or older employed? B
(1) In Country X, 11.3 percent of the population is 65 years old or older.
(2) In Country X, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed
90.On Jane's credit card account, the average daily balance for a 30-day billing cycle is the average (arithmetic mean) of the daily balances at the end of each of the 30 days. At the beginning of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Jane's account for the billing cycle? D
(1) Jane's payment was credited on the 21st day of the billing cycle.
(2) The average daily balance through the 25th day of the billing cycle was $540.
119.A contractor combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture
that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G, by weight. What
is the value of x ? D
(1) y = 10
(2) z = 16
187.If x, y, and z are integers greater than 1, what is the value of x + y + z ? A
(1) xyz = 70
(2) 10x = 7yz
这些题目都是Prep里面的数据充分性题目，是我感觉比较难的题目，求助会解答的同学们。。。 |
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