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【逻辑CR】
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species. Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates. Clearly, dropping this restriction would allow the other species to recover. Which of the following, if true, most seriously undermines the argument?
【数据充分DS】
A share of company P is 20 percent more expensive than a share of company Q. What is the ratio of the total value of shares outstanding of company Q to the total value of shares outstanding of company P?(1)The trading volume of shares of company Q is 25 percent more than that of company P.(2) The value of shares outstanding of company Q is $6,000,000 and the value of shares outstanding of company P is $8,000,000.
【数据充分DS】
A fraternity wants to enroll members of the college rowing team as members. The result of the fraternity's effort to recruit new members from the rowing team exceeds the fraternity's expectation by 20 percent. Assuming that the rowing team admits only males, what is the total number of people on the rowing team?(1) The goal was to enroll 15 percent of the members of the rowing team.(2) The number of rowing team members enrolling as new fraternity members was 40.
【问题求解PS】
The letters C, I, R, C, L and E can be used to form 6-letter strings such as CIRCLE or CCIRLE. Using these letters, how many different 6-letter strings can be formed in which the two occurrences of the letter C are separated by at least one other letter?
【数据充分DS】
The cost of each adult's ticket for a certain concert was $30, and the cost of each child's ticket for the concert was $24. If Hannah purchased tickets for this concert, what was the average (arithmetic mean) cost per ticket?(1) Hannah purchased twice as many children's tickets as adults' tickets.(2) Hannah purchased 4 children's tickets.
【数据充分DS】
If the prime numbers p and t are the only prime factors of the integer m, is m a multiple of p2 t ?(1) m has more than 9 positive factors.(2) m is a multiple of p3 .
【数据充分DS】
If m and r are two numbers on a number line, what is the value of r ?(1) The distance between r and 0 is 3 times the distance between m and 0 .(2) 12 is halfway between m and r.
【数据充分DS】
If t is a positive integer and r is the remainder when t2 + 5t + 6 is divided by 7, what is the value of r ?(1) When t is divided by 7, the remainder is 6.(2) When t2 is divided by 7, the remainder is 1.
【数据充分DS】
If n is a positive integer and r is the remainder when n2 - 1 is divided by 8, what is the value of r ?(1) n is odd.(2) n is not divisible by 8.
【数据充分DS】
If n is an integer between 2 and 100 and if n is also the square of an integer, what is the value of n ?(1) n is even.(2) The cube root of n is an integer.
【数据充分DS】
If the product of the three digits of the positive integer k is 14, what is the value of k ? (1) k is an odd integer. (2) k < 700
【数据充分DS】
If $1,000 is deposited in a certain bank account and remains in the account along with any accumulated interest, the dollar amount of interest I , earned by the deposit in the first n years is given by the formula I = , where r percent is the annual interest rate paid by the bank. Is the annual interest rate paid by the bank greater than 8 percent? (1) The deposit earns a total of $210 in interest in the first two years. (2)
【数据充分DS】
Each of the students in a certain class received a single grade of P, F, or I. What percent of the students in the class were females? (1) Of those who received a P, 40 percent were females. (2) Of those who received either an F or I, 80 percent were males.
【数据充分DS】
If -2x > 3y, is x negative?(1) y > 0(2) 2x + 5y - 20 = 0
【数据充分DS】
One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y. Is x < 0.8 ?(1) y > 0.15(2) C >= 7.30
【数据充分DS】
Is x > y ? (1) x + y < 0 (2) x - y > 0
【数据充分DS】
Is m + z > 0 ? (1) m - 3z > 0 (2) 4z - m > 0
【数据充分DS】
If° represents one of the operations +,-, and x, is k°(£ +m) =(k ° £)+(k ° m)for all numbers k,£,andm?(1) k ° 1is not equal to 1 ° k for some numbers k.(2) ° represents subtraction.
【数据充分DS】
In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint of side BC. If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS(1) The area of triangular region ABX is 32.(2) The length of one of the altitudes of triangle ABC is 8.
【数据充分DS】
Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees? (1) Two of the interior angles of ABCD are right angles.(2) The degree measure of angle ABC is twice the degree measure of angle BCD.