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JeegarM requesting for OA

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by jeegarm » Mon Sep 29, 2008 7:46 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.
X
4
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer:
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Source: — Problem Solving |

by dumb.doofus » Mon Sep 29, 2008 8:11 pm
C

a) implies j/s = 3/4 not sufficient
b) implies s = j + 5 not sufficient

together sufficient.
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by stop@800 » Tue Sep 30, 2008 3:15 am
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