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Beginning in 1997, high school seniors in State Q have been

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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 27 Dec 2011, 18:47
easy one
Clearly B
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 23 Feb 2012, 11:28
Actually I see the light here. Sorry for my earlier posts. Come to think of it, this was pretty straightforward. It is highly confusing because you have to go through all the optins in any case in a question like this, since it asks for the least possible. So many numbers are being talked about and randomly, so I guess this was a reall cracker.

But here is the reason that I think. Here is how:

From Question Stem:
"In 1998, the number of seniors who passed the exam decreased by 10% from the previous year". This is the key statement. We already know that the number of students is less in 1998 than in 1997. Just re-read the statement and it is obvious.

Now Option B says:

B. If the percentage of high school seniors who passed the exam decreased from 1997 to 1998 , the number of high schools seniors increased during that time period.

We already know that the number of student decreased so B is totally out of the question, the least likely.
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 15 Mar 2012, 21:40
Eventually got the answer but this took me a lot of time.Is it possible to solve questions like these in under 2 minutes?
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 15 Mar 2012, 22:00
Really tough one....

Good question
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 15 Dec 2012, 11:42
It immediately read like a question beyond Einstein and so with 2.23 already on the clock, chose to say screw it, moving on and selected B because c,d and e suspiciously gave some precise, extra info, so left between A and B, i was like this question is a real B!tch, which starts with B. so imma choose B. where's that meme with a baby pulling a heck yeah fist punch.

devinawilliam83 wrote:
Eventually got the answer but this took me a lot of time.Is it possible to solve questions like these in under 2 minutes?
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 15 Dec 2012, 12:18
Took me over 3 mins to solve! a hard one, but i agree that its B.
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 25 Mar 2013, 13:22
The answer is B, simply because it is not necessarily true. All the others are necessarily true.
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 29 Mar 2013, 04:31
I think most of you are getting it wrong. % increase is not the same as total increase.

Total increase deals with the number of students changing from year to year (absolute value).

Percentage increase deals with the number of students passing and not passing for a given year (relative value).

Check attachment for an in-depth analysis of options A and B.
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 24 May 2013, 07:59
devinawilliam83 wrote:
Eventually got the answer but this took me a lot of time.Is it possible to solve questions like these in under 2 minutes?


I think the answer is (E)
Pass Fail Total
1997 80 20 100
1998 72( 10% of 80) ? X


Option(E) - If the percentage of high school seniors who passed the exam in 1998 was less than 70 percent, the number of high school seniors in 1997 was higher than the number in 1998.
so , lets say the percentage of the passed students is 69% (less than 70) ....so 72/ X *100 = 69 so x has to greater than 100 in order to produce a result =69 or less and the nbr of students in 1997 was 100 hence proved ( E) is least likely .

Option (B) - If the percentage of high school seniors who passed the exam decreased from 1997 to 1998 , the number of high schools seniors increased during that time period.
Let P be Pass percent in 1998 and X is total nbr of students , then P/100 * X =72 and P < 80% , without knowing P we cant for sure say whether X has increased or decreased as there are 2 unknown's .It may be possible or it might not be .

But (E) is impossible option so ans is (E)
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 24 Nov 2013, 22:51
We have to realize, answer is between A and B, and thus discard c,d,e and save time.
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 15 Feb 2014, 17:37
devinawilliam83 wrote:
Eventually got the answer but this took me a lot of time.Is it possible to solve questions like these in under 2 minutes?


number vs percentage ...this one is actually very easy
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Re: Beginning in 1997, high school seniors in State Q have been [#permalink] New post 16 Apr 2014, 19:53
adhiraj wrote:
Beginning in 1997, high school seniors in State Q have been required to pass a comprehensive proficiency exam before they are allowed to graduate. The exam requirement was intended to ensure that a minimum level of academic quality will be achieved by the students in the state. In 1997, 20 percent of the seniors did not pass the exam and were, therefore, not allowed to graduate. In 1998, the number of seniors who passed the exam decreased by 10% from the previous year.

The argument above, if true, LEAST supports which of the following statement.

A. If the percentage of high school seniors who passed the exam increased from 1997 to 1998 , the number of high schools seniors decreased during that time period.
B. If the percentage of high school seniors who passed the exam decreased from 1997 to 1998 , the number of high schools seniors increased during that time period.
C. Unless the number of high school seniors was lower in 1998 than in 1997, the number of seniors who passed the exam in 1998 was lower than 80 percent.
D. If the number of high school seniors who did not pass the exam decreased by more than 10 percent from 1997 to 1998, the percentage of high school seniors who passed the exam in 1998 was greater than 80 percent.
E. If the percentage of high school seniors who passed the exam in 1998 was less than 70 percent, the number of high school seniors in 1997 was higher than the number in 1998.

Please provide an explanation with actual numbers.

OA:
[Reveal] Spoiler:
B

THIS QUESTION needs mathematical analysis for all 5 ans options and stimulus as well........any confusion in even one analysis will delay the solution time...
will definitely take more than 2.5- 3 mins for most students....
Re: Beginning in 1997, high school seniors in State Q have been   [#permalink] 16 Apr 2014, 19:53
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