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09 Sep 2010, 07:52
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
62% (01:34) correct
38%
(01:33)
wrong
based on 216
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History
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Not Attempted Yet
In a class of 30 students, 17 students study Chinese, and r students study Japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?
(1) r = 14
(2) Thirteen students take only Japanese.
(1) r = 14
(2) Thirteen students take only Japanese.
09 Sep 2010, 09:21
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rxs0005
In a class of 30 students, 17 students study Chinese, and r students study Japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?
(1) r = 14
(2) Thirteen students take only Japanese.
(1) r = 14
(2) Thirteen students take only Japanese.
1.so we have C=17 and r=14. so we can see the overlap here. SUFF
2. so we know 13 take only japanese so we have 17 students left who study chinese BUT we dont know the dual language students so INSUFF
09 Sep 2010, 09:55
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rxs0005
In a class of 30 students, 17 students study Chinese, and r students study Japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?
(1) r = 14
(2) Thirteen students take only Japanese.
(1) r = 14
(2) Thirteen students take only Japanese.
{Total} = {Chinese} + {Japanese} - {Both} --> 30=17+{Japanese} - {Both} --> {Japanese} - {Both}=13.
Question: {Both}=?
(1) {Japanese}=14 --> 14-{Both}=13 --> {Both}=1. Sufficient.
(2) {Japanese} - {Both}=13 --> the same info as in stem. Not sufficient.
Answer: A.
