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07 Jul 2020, 01:32
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
47% (01:55) correct
53%
(02:13)
wrong
based on 295
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Over the past 5 years, 95% of chemistry majors enrolled in a specific chemistry course have passed the final exam. During this same period only 70% of the other students enrolled in the chemistry course are able to pass the final. How many students passed the final exam in this chemistry course last semester?
(1) There were 120 chemistry students enrolled in the course last semester.
(2) 64 chemistry majors passed the final exam last semester.
Are You Up For the Challenge: 700 Level Questions
(1) There were 120 chemistry students enrolled in the course last semester.
(2) 64 chemistry majors passed the final exam last semester.
Are You Up For the Challenge: 700 Level Questions
yashikaaggarwal
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07 Jul 2020, 02:26
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(1) There were 120 chemistry students enrolled in the course last semester.
120 = 100% chemistry students including chemistry major students too.
We need the total no. Of students who are enrolled in chemistry course. Or the percentage enrolled in chemistry course having no science major to determine total no. Of pass students. (Insufficient)
(2) 64 chemistry majors passed the final exam last semester.
64 = 95% students passed the exam. 100% = 64*100/95 = 67. But, We need the total no. Of students who are enrolled in chemistry course. (Insufficient)
Together 1&2: The total no.of students or the percentage is not mentioned. Hence Insufficient
IMO E
Posted from my mobile device
120 = 100% chemistry students including chemistry major students too.
We need the total no. Of students who are enrolled in chemistry course. Or the percentage enrolled in chemistry course having no science major to determine total no. Of pass students. (Insufficient)
(2) 64 chemistry majors passed the final exam last semester.
64 = 95% students passed the exam. 100% = 64*100/95 = 67. But, We need the total no. Of students who are enrolled in chemistry course. (Insufficient)
Together 1&2: The total no.of students or the percentage is not mentioned. Hence Insufficient
IMO E
Posted from my mobile device
07 Jul 2020, 05:27
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Bunuel
Ordinarily this configuration of information would be sufficient, if we used both Statements. If all the data in the question was about "last semester", then using Statement 2 and the "95%" figure in the stem, you could find the number of chemistry majors in total, then subtracting that from the 120 in Statement 1, you could find the number of non-majors. Finally using the "70%" in the stem, you could work out how many non-majors passed, and add that to the 64 in Statement 2 to answer the question.
But the percentages in the stem tell us about what has happened "over the past 5 years". We have no idea specifically what happened "last semester" so we have no hope of answering the question, and the answer is an almost instant E.
