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by jainrahul1985 » Tue May 11, 2010 10:23 pm
If each of the students in a certain mathematics class is either a junior or a senior, how many students are in the class?
(1) If one student is to be chosen at random from the class to attend a conference,the probability that the student chosen will be a senior is 4/7.
(2) There are 5 more seniors in the class than juniors.

OA C
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by liferocks » Tue May 11, 2010 10:28 pm
From 1 we can conclude

Total student =7x
number of seniors=4x..does not provide an absolute value ..hence not sufficient

From 2..total student=2*total senior-5...does not provide an absolute value ..hence not sufficient

combining

7x=8x-5 or x=5
so total number of student=7*5=35

Ans option C
please post DS question under DS thread
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