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At least 100 students at a certain high school study japanes [#permalink]
17 Oct 2009, 12:07

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A

B

C

D

E

Difficulty:

95% (hard)

Question Stats:

42% (02:09) correct
58% (01:30) wrong based on 530 sessions

At least 100 students at a certain high school study Japanese. If 4 percent of the studetns at the school who study French also study Japanese, do more students at the school study french than Japanese?

(1) 16 students at the school study both French and Japanese (2) 10 percent of the students at the school who study Japanese also study French.

Re: Japanese studetns [#permalink]
17 Oct 2009, 13:05

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amitgovin wrote:

At least 100 students at a certain high school study japanese. If 4 percent of the studetns at the school who study french also study japanese, do more students at the school study french than japanese?

1) 16 students at the school study both french and japanese

2) 10 percent of the students at the schoool who study japanese also study french.

please explain. thanks.

Given: \(J\geq{100}\) and \(0.04*F=Both\)

Q: is \(F>J\)?

(1) \(Both=16=0.04*F\) --> \(F=400\). We don't know \(J\). Not sufficient

number of japanese students >= 100 number of students who study japanese and french = 4% of french students

st 1) 16 studens study both japanese and french = 4% of french studens so number of french students = 16 * 100/4 = 400 but we dont know how many studetns study japanese. Not sufficient

st 2) number of students who study japanese and french = 10% of japanese = 4% of french so french studens > japanese students Sufficient

Atleast 100 students at a certain high school study Japanes. If 4 Percent of the students at the school who study French also study Japanes, do more students at the school study French than Japanes

1.16 Students at the school study both French and japanese. 2.10 Percent of the students at the school who study Japanese also study French

Please explain the way to solve these kind of probelms.

Thanks -H

Is it B? 1. 16 students study both F and J, so there are 400 students studying F: insuff 2. 10% J study F while 4%F study J, so the number of students studying F is greater than that of studens studying J

1. 16 students study both French and Japanese. This means 400 students study French, since 4% of 400 is 16, however we don't know how many students study Japanese. INSUFF

2. This tells us 0.1J also study French. This number is actually identical to 0.04F because it represents the same quantity, which is the number of students who study both French and Japanese!

=> 0.1J = 0.04F => J = 0.4F Thus more students study Japanese than French! Sufficient

The 4% is for J&F not F alone (Thus it comprises students who study both Japanese and French). Hence, the statement 10% of J = 4 % of F is not correct. If we combine the two statements, we will get a definite answer:

From (1), we get F=400 From (2), we get 10% of J = 4% of J&F. From (1), J&F=16, therefore, if 10% of J = 16, J=160. Thus J<F. The two statements combined are sufficient.

The 4% is for J&F not F alone (Thus it comprises students who study both Japanese and French). Hence, the statement 10% of J = 4 % of F is not correct. If we combine the two statements, we will get a definite answer:

From (1), we get F=400 From (2), we get 10% of J = 4% of J&F. From (1), J&F=16, therefore, if 10% of J = 16, J=160. Thus J<F. The two statements combined are sufficient.

Correct me if I am wrong...

Thus, my ans. is (C).

OA for this question is B.

Let # of students who study Japanese be \(J\), the # of of students who study French be \(F\) and # of students who study Japanese and French be \(F&J\).

From stem # of students who study Japanese and French is 4% of the # of students who study French --> \(F&J=4%F\);

From (2) # of students who study Japanese and French is 10% of the # of students who study Japanese (so MORE share of the same group) --> \(F&J=10%J\).

So, \(10%J=4%F\) --> \(\frac{F}{J}=2.5\) --> \(F>J\). _________________

At least 100 students at a certain high school study japanese. If 4 percent of the studetns at the school who study french also study japanese, do more students at the school study french than japanese? 1) 16 students at the school study both french and japanese 2) 10 percent of the students at the schoool who study japanese also study french. Let's put it this way... From (1) --> 16 students study both F&J = 4% of F So F = 400, but we don't know how many students who study J coz they said "AT LEAST 100"

From (2) --> 10%J = 4%F --> we know that F is greater than J because only 4% of F is equal to 10% of J

16 students study F and J. There should be 400 students studying F. The number of J students could be any of 300 or 400 or 500 (lesser or greater? cannot tell).

Statement 2:

Let x be the number of students who study F and J.

x is 4% of F x is 10% of J. This implies that J is definitely lesser than F.

Re: Atleast 100 students - DS - 700 level [#permalink]
15 Aug 2010, 23:28

1

This post received KUDOS

lalithajob wrote:

At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?

1) 16 students at the school study both French and Japanese. 2) 10 percent of the students at the school who study Japanese also study French.

Let J represent the set of students studying Japanese and F represent the set of students studying French F^J is the set of students studying both Japanese and French From the question J>=100 , .04F= F^J , is F>J ?

1) F^J=16 => .04F =16 => F=400 . We still don't have any information about J. It can >=100. If 100<= j<400 , F>J. Otherwise F<=J. So not sufficient 2) .1J = F^J => .1J=.04F => F = 2.5 J . Clearly F is bigger than J. So sufficient

Answer B _________________

___________________________________ Please give me kudos if you like my post

Re: French & Japanese [#permalink]
19 Feb 2012, 19:15

Answer should be E. Here is how:

Question: At least \(100\) students at a certain high school study Japanese. If \(4\) percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?

Statement A: \(16\) students at the school study both French and Japanese.

We know that \(4%\) of the students who study french also study Japanese, which means that of those who study french, \(4%\) also study Japanese and there are \(16\) such people. So we can set up an equation as below:

Let \(x=\) no of people who study french. So:

\(\frac{4}{100}*(x)=16\) so \(x=400\) , so \(400\) people study French but we the number of Japanese students is greater than \(100\) and we do not know the exact number so japanese students could be less than \(400\) or greater than \(400\). Hence Insufficient.

Statement B: 10 percent of the students at the school who study Japanese also study French.

From Statement B we can see that:

\(4%\) of French Students \(= 10%\) of Japanese Students

So definitely the number of French Students is greater. Hence Sufficient.

Answer B. _________________

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Re: At least 100 students at a certain high school study japanes [#permalink]
14 Nov 2014, 02:06

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At least 100 students at High school study Japanese. [#permalink]
22 Jan 2015, 22:33

Hey All,

Need to know...How to solve this DS Problem.

At least 100 students at High school study Japanese. If 4% of the students at the school who study French also study Japanese, Do more students study french than Japanese

(1) 16 students at the school study both French and Japanese (2) 10 % of the students at the school who study Japanese also study French.

Re: At least 100 students at a certain high school study japanes [#permalink]
23 Jan 2015, 02:21

Expert's post

sharadnc wrote:

Hey All,

Need to know...How to solve this DS Problem.

At least 100 students at High school study Japanese. If 4% of the students at the school who study French also study Japanese, Do more students study french than Japanese

(1) 16 students at the school study both French and Japanese (2) 10 % of the students at the school who study Japanese also study French.

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