●Question 1. Sentence Correction

Direction: Correct the underlined part

A report by the American Academy for the Advancement of Science has concluded that much of the currently uncontrolled dioxins to which North Americans are exposed comes from the incineration of wastes.

(a) much of the currently uncontrolled dioxins to which North Americans are exposed comes

(b) much of the currently uncontrolled dioxins that North Americans are exposed to come

(c) much of the dioxins that are currently uncontrolled and that North Americans are exposed to comes

(d) many of the dioxins that are currently uncontrolled and North Americans are exposed to come

(e) many of the currently uncontrolled dioxins to which North Americans are exposed come

Answer : E

The answer choices of A, B, and C are committing a decisive error in terms of using ‘much’ for ‘dioxins,’ which should be treated as a countable plural noun. In D, the incomplete sentence ‘North Americans are exposed to’ should have a relative pronoun such as ‘that’ or ‘which’ in front of the sentence to make a parallel structure with the preceding relative clause ‘that are currently uncontrolled’. So, the answer is E.

●Question 2. Critical Reasoning

For similar cars and drivers, automobile insurance for collision damage has always cost more in Greatport than in Fairmont. Police studies, however, show that cars owned by Greatport residents are, on average, slightly less likely to be involved in a collision than cars in Fairmont. Clearly, therefore, insurance companies are making a greater profit on collision-damage insurance in Greatport than in Fairmont.

Which of the following is an assumption on which the argument depends?

A. Repairing typical collision damage does not cost more in Greatport than in Fairmont.

B. There are no more motorists in Greatport than in Fairmont.

C. Greatport residents who have been in a collision are more likely to report it to their insurance company than Fairmont residents are.
D. Fairmont and Greatport are the cities with the highest collision-damage insurance rates.

E. The insurance companies were already aware of the difference in the likelihood of collisions before the publication of the police reports.

Answer: A

The question is asking for an answer choice that supports the author’s conclusion that insurance companies are making more money from Greatport because they charge more to drivers in Greatport than in Fairmont although Greatport residents are less likely to get involved in a collision. Since profit is derived by subtracting cost from revenue, proving that insurance companies’ costs in Greatport are not higher than Fairmont can support the author’s argument. Therefore, choice (A) is the correct answer since repairing costs are one component of insurance companies’ costs.

●Question 3. Data Sufficiency

Directions: In this problem, a question is followed by two statements containing certain data. You are to determine whether the data provided by the statements are sufficient to answer the question. Choose the correct answer based upon the statement’s data and your knowledge of mathematics.

If n and m are positive integers, what is the remainder of n+m to be divided by 6?

1) The remainder of n to be divided by 6 is 1.

2) The remainder of m to be divided by 6 is 3.

A. statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question

B. statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question

C. both statements taken together are sufficient to answer the question, but neither statement alone is sufficient

D. each statement alone is sufficient
The question is asking for an answer choice that supports the author’s conclusion that insurance companies are making more money from Greatport because they charge more to drivers in Greatport than in Fairmont although Greatport residents are less likely to get involved in a collision. Since profit is derived by subtracting cost from revenue, proving that insurance companies’ costs in Greatport are not higher than Fairmont can support the author’s argument. Therefore, choice (A) is the correct answer since repairing costs are one component of insurance companies’ costs.

E. statements 1 and 2 together are not sufficient, and additional data is needed to answer the question

●Answer to Q3: C

On the original condition, the number of variables is 2, the answer is C, 1) & 2) n=1,7,13,19, 25,.. m=3, 9, 15, 21, 27, .... m+n=4,10,16,22....the remainder is 4, sufficient. Therefore the best answer is C.

●Question 4. Problem Solving

If n=p*q*r, where p,q and r are different prime numbers, how many different positive divisors does n have, including 1 and n?

A. 3 B. 5 C. 6 D. 7 E. 8
●Answer to Q4: E

n=p^1*q^1*r^1, the number of the factors of n is (1+1)(1+1)(1+1)=8. Therefore, the best answer is E.

STN Academy helps students prepare for the GMAT (Graduate Management Admission Test), which is required by most business schools in the world. It is located near Gangnam Station in southern Seoul. Visit www.stnacademy.com or call 02-501-4801 for more information.