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09 Jan 2014, 06:54
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B
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Difficulty:
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Question Stats:
91% (01:09) correct
9%
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wrong
based on 936
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The Official Guide For GMAT® Quantitative Review, 2ND Edition
John took a test that had 60 questions numbered from 1 to 60. How many of the questions did he answer correctly?
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly.
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
John took a test that had 60 questions numbered from 1 to 60. How many of the questions did he answer correctly?
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly.
(A) Statement 1 alone is sufficient, but statement 2 alone is not.
(B) Statement 2 alone is sufficient, but statement 1 alone is not.
(C) Both statements together are sufficient, but neither alone is sufficient.
(D) Each statement alone is sufficient.
(E) Neither statement is sufficient, even when combined.
Data Sufficiency
Question: 29
Category: Arithmetic Fractions
Page: 155
Difficulty: 600
Question: 29
Category: Arithmetic Fractions
Page: 155
Difficulty: 600
GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project
Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.
We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.
Thank you!
Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.
We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.
Thank you!
Solving this question helps.
Taking a timed set of similar questions in
GMAT Club Forum Quiz →
is even better.
09 Jan 2014, 06:54
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SOLUTION
John took a test that had 60 questions numbered from 1 to 60. How many of the questions did he answer correctly?
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test --> F = S + 7. Not sufficient.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly. Since there are 30 odd-numbered questions and 30 even-numbered questions, then the number of questions answered correctly is 5/6*30 + 4/5*30. Sufficient.
Answer: B.
John took a test that had 60 questions numbered from 1 to 60. How many of the questions did he answer correctly?
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test --> F = S + 7. Not sufficient.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly. Since there are 30 odd-numbered questions and 30 even-numbered questions, then the number of questions answered correctly is 5/6*30 + 4/5*30. Sufficient.
Answer: B.
09 Jan 2014, 07:13
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John took a test that had 60 questions numbered from 1 to 60. How many of the questions did he answer correctly?
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly.
(1) Insufficient : He may have answered 2 correctly in the second half and therefore 9 in the first half . So, he could have answered 11correct. Similarly, 3 in the second half and therefore 10 in the first half . so, the result will be 13. Two different answers so (1) is not sufficient.
(2) Sufficient : Given that we know the total number of the questions and also how many odd and how many even there are, the question turns into simple multiplication.
Answer : B
(1) The number of questions he answered correctly in the first half of the test was 7 more than the number he answered correctly in the second half of the test.
(2) He answered 5/6 of the odd-numbered questions correctly and 4/5 of the even-numbered questions correctly.
(1) Insufficient : He may have answered 2 correctly in the second half and therefore 9 in the first half . So, he could have answered 11correct. Similarly, 3 in the second half and therefore 10 in the first half . so, the result will be 13. Two different answers so (1) is not sufficient.
(2) Sufficient : Given that we know the total number of the questions and also how many odd and how many even there are, the question turns into simple multiplication.
Answer : B
