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A student has decided to take GMAT and TOEFL examinations [#permalink]

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19 Jun 2012, 08:52

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A

B

C

D

E

Difficulty:

75% (hard)

Question Stats:

51% (03:29) correct
49% (05:03) wrong based on 542 sessions

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A student has decided to take GMAT and TOEFL examinations, for which he has allocated a certain number of days for preparation. On any given day, he does not prepare for both GMAT and TOEFL. How many days did he allocate for the preparation?

(1) He did not prepare for GMAT on 10 days and for TOEFL on 12 days. (2) He prepared for either GMAT or TOEFL on 14 days.

A student has decided to take GMAT and TOEFL examinations, for which he has allocated a certain number of days for preparation. On any given day, he does not prepare for both GMAT and TOEFL. How many days did he allocate for the preparation?

It's more Overlapping Sets problem than Statistics, I guess.

We have: {Total} = {GMAT } + {TOEFL} - {Both} + {Neither}. Since we are told that "on any given day, he does not prepare for both GMAT and TOEFL", then {Both} = 0, so {Total} = {GMAT } + {TOEFL} + {Neither}. We need to find {Total}

(1) He did not prepare for GMAT on 10 days and for TOEFL on 12 days --> {Total} - {GMAT } = 10 and {Total} - {TOEFL} =12. Not sufficient. (2) He prepared for either GMAT or TOEFL on 14 days --> {GMAT } + {TOEFL} = 14. Not sufficient.

(1)+(2) We have three linear equations ({Total} - {GMAT } = 10, {Total} - {TOEFL} =12 and {GMAT } + {TOEFL} = 14) with three unknowns ({Total}, {GMAT }, and {TOEFL}), so we can solve for all of them. Sufficient.

Answer: C.

Just to illustrate. Solving gives: {Total} = 18 - he allocate total of 18 days for the preparation; {GMAT } = 8 - he prepared for the GMAT on 8 days; {TOEFL} = 6 - he prepared for the TOEFL on 6 days; {Neither} = 4 - he prepared for neither of them on 4 days.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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20 Jun 2012, 23:39

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Hi,

Using Venn diagram approach, (my favorite ) let, a = Days on which student prepares for GMAT, b = Days on which student prepares for Toefl, c = Days on which student prepares neither for GMAT nor for TOEFL,

Using (1), He did not prepare for GMAT on 10 days and for TOEFL on 12 days a+c=12 b+c=10, two equation, 3 variables. can't solve.Insufficient.

Using (2) He prepared for either GMAT or TOEFL on 14 days a+b=14. Insufficient.

Combining both (1) & (2), a+c=12 b+c=10 a+b=14, addition all three, 2(a+b+c)=36 a+b+c=18, Sufficient.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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11 Sep 2012, 05:28

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Is this a badly worded question? - it tells me that how many days of preparation has the student taken, but if he has studied for neither GMAT or TOEFL then this idle day is not a day of preparation and doesnt count.

Therefor the answer is D, both can give us the answer
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I can only see that the correct answer is C but I don't see any of the answer choices.

This is a data sufficiency question.

The data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of the word counterclockwise), you must indicate whether—

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked. C. BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked. D. EACH statement ALONE is sufficient to answer the question asked. E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

The correct answer to this question is C: BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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07 Jan 2013, 00:16

jordanshl wrote:

Is this a badly worded question? - it tells me that how many days of preparation has the student taken, but if he has studied for neither GMAT or TOEFL then this idle day is not a day of preparation and doesnt count.

Therefor the answer is D, both can give us the answer

I thought the same too.. Could somebody please confirm?
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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07 Jan 2013, 18:48

Sachin9 wrote:

jordanshl wrote:

Is this a badly worded question? - it tells me that how many days of preparation has the student taken, but if he has studied for neither GMAT or TOEFL then this idle day is not a day of preparation and doesnt count.

Therefor the answer is D, both can give us the answer

I thought the same too.. Could somebody please confirm?

I agree... the wording of this question sucks, it's not clear if the days he did not spend studying should be taken into consideration

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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07 Jan 2013, 20:01

Vaico wrote:

Sachin9 wrote:

jordanshl wrote:

Is this a badly worded question? - it tells me that how many days of preparation has the student taken, but if he has studied for neither GMAT or TOEFL then this idle day is not a day of preparation and doesnt count.

Therefor the answer is D, both can give us the answer

I thought the same too.. Could somebody please confirm?

I agree... the wording of this question sucks, it's not clear if the days he did not spend studying should be taken into consideration

what makes me worried is that this question appears in the gmatclub math book.
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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26 Jan 2013, 09:52

Sachin9 wrote:

aishwarye wrote:

Can this question come in GMAT ? I doubt because i've never seen such SETs qshn ever. Whats the source pl ?

congrats on your first post.

This question will never come in GMAT.. Guaranteed. IMHO One that's floating around in internet,never :D

Thank you for the warm welcome Sachin ! I have baan a part of gmatclub since long.. Now trying to get active.. i think getting active on gmatclub will keep me focussed and help learn more !

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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26 Jan 2013, 19:34

aishwarye wrote:

Sachin9 wrote:

aishwarye wrote:

Can this question come in GMAT ? I doubt because i've never seen such SETs qshn ever. Whats the source pl ?

congrats on your first post.

This question will never come in GMAT.. Guaranteed. IMHO One that's floating around in internet,never :D

Thank you for the warm welcome Sachin ! I have baan a part of gmatclub since long.. Now trying to get active.. i think getting active on gmatclub will keep me focussed and help learn more !

yupp . . all the best!!
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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28 Aug 2013, 03:03

What is the difference between following two statements: (2) He prepared for either GMAT or TOEFL on 14 days. // I considered it 14 days GMAT or 14 days TOEFL, not G + T =14. OR (2) He prepared for GMAT and TOEFL on 14 days. // this can be interpreted as G + T =14.
_________________

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Re: A student has decided to take GMAT and TOEFL examinations [#permalink]

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05 May 2014, 23:20

PiyushK wrote:

What is the difference between following two statements: (2) He prepared for either GMAT or TOEFL on 14 days. // I considered it 14 days GMAT or 14 days TOEFL, not G + T =14. OR (2) He prepared for GMAT and TOEFL on 14 days. // this can be interpreted as G + T =14.

I am having the same confusion. Bunuel can you please explain how to interpret this ?

Sentence was - "He prepared for either GMAT or TOEFL on 14 days"

Why can't this be interpreted as G/T = 14 i.e. 14 days could be either for G or for T

What is the difference between following two statements: (2) He prepared for either GMAT or TOEFL on 14 days. // I considered it 14 days GMAT or 14 days TOEFL, not G + T =14. OR (2) He prepared for GMAT and TOEFL on 14 days. // this can be interpreted as G + T =14.

I am having the same confusion. Bunuel can you please explain how to interpret this ?

Sentence was - "He prepared for either GMAT or TOEFL on 14 days"

Why can't this be interpreted as G/T = 14 i.e. 14 days could be either for G or for T

"He prepared for either GMAT or TOEFL on 14 days" means that out of 14 days some were for GMAT and the rest for TOEFL. It does not mean that either all 14 were for GMAT or all 14 were for TOEFL.
_________________

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