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
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