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A certain research group plans to create computer models of [#permalink]
09 Sep 2013, 09:59
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A
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Difficulty:
65% (hard)
Question Stats:
51% (02:33) correct
49% (01:33) wrong based on 302 sessions
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
A. x*x – 5x B. (x)(105 – x) C. (100)(105 – x) D. (100)(95 – x) E. (x-5)/100
Re: A certain research group plans to create computer models of [#permalink]
09 Sep 2013, 12:35
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suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
Initial: (x/100)*10000 = 100x (bacterial species) After reduce BY (x - 5)%, the percentage of bacterial species = 1 - (x - 5)% = 1 - (x - 5)/100 = (105 - x)/100 Note: Difference between "reduce to" [means: the remain] and "reduce by" [means: the remain = 1 - "reduce by"] So, the number of bacterial species after reducing: 100x*(105 - x)/100 = (x)*(105 - x) Ans is B.
Re: A certain research group plans to create computer models of [#permalink]
09 Sep 2013, 16:20
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
I believe the OA may be wrong. I got:
x% of 10000 is: \(\frac{x}{100}(10,000) = 100x\)
The reduced percentage can be stated as follows: \((1 - \frac{x-5}{100})\) \(=\) \((\frac{105-x}{100})\)
Multiplying the selection by the reduced percentage: \(100x\) \((\frac{105-x}{100})\) \(=\) \(x(105-x)\)
B _________________
If my post has contributed to your learning or teaching in any way, feel free to hit the kudos button ^_^
Re: A certain research group plans to create computer models of [#permalink]
09 Sep 2013, 17:38
I think OA is wrong too, but i got D.
out of 10,000 samples, 10,000(x-5)% will be studied. If x was originally 50%, that means 5,000 would have been studied. now at 50%-5%, 4,500 will be studied.
Re: A certain research group plans to create computer models of [#permalink]
11 Oct 2013, 01:37
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suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
The number of species that the group plans to model = \(10,000*\frac{x}{100} = 100x\).
After a budget cut, the group finds it must reduce this selection by (x − 5)%, thus the group will be able to model \(100x*(1-\frac{x-5}{100})=x(105-x)\).
Re: A certain research group plans to create computer models of [#permalink]
11 Oct 2013, 04:15
Bunuel wrote:
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
The number of species that the group plans to model = \(10,000*\frac{x}{100} = 100x\).
After a budget cut, the group finds it must reduce this selection by (x − 5)%, thus the group will be able to model \(100x*(1-\frac{x-5}{100})=x(105-x)\).
Re: A certain research group plans to create computer models of [#permalink]
10 Jan 2014, 06:14
1
This post received KUDOS
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
Use smart numbers.
OK lets say x = 50
So then 50% of 10,000 = 5000 Now after budget cut = 5000*45/100 = (50)(45)
Re: A certain research group plans to create computer models of [#permalink]
20 Jul 2014, 04:43
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
A. \(\frac{x-5}{100}\) B. x^2 – 5x C. (x)(105 – x) D. (100)(105 – x) E. (100)(95 – x) _________________
“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”
Re: A certain research group plans to create computer models of [#permalink]
20 Jul 2014, 04:46
1
This post received KUDOS
Expert's post
WoundedTiger wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
A. \(\frac{x-5}{100}\) B. x^2 – 5x C. (x)(105 – x) D. (100)(105 – x) E. (100)(95 – x)
Merging topics.
Please refer to the discussion above. _________________
Re: A certain research group plans to create computer models of [#permalink]
22 Jul 2014, 12:13
Bunuel wrote:
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
The number of species that the group plans to model = \(10,000*\frac{x}{100} = 100x\).
After a budget cut, the group finds it must reduce this selection by (x − 5)%, thus the group will be able to model \(100x*(1-\frac{x-5}{100})=x(105-x)\).
Answer: B.
Hope it's clear.
Hi why you wrote 1- (x-5)% in the last step? could not understand the step.
Re: A certain research group plans to create computer models of [#permalink]
22 Jul 2014, 22:57
GGMAT760 wrote:
Bunuel wrote:
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
a) x*x – 5x b) (x)(105 – x) c) (100)(105 – x) d) (100)(95 – x) e) (x-5)/100
The number of species that the group plans to model = \(10,000*\frac{x}{100} = 100x\).
After a budget cut, the group finds it must reduce this selection by (x − 5)%, thus the group will be able to model \(100x*(1-\frac{x-5}{100})=x(105-x)\).
Answer: B.
Hope it's clear.
Hi why you wrote 1- (x-5)% in the last step? could not understand the step.
Thanks in advance
Actually its a reduction of (x-5)%; so written in that way
A certain research group plans to create computer models of [#permalink]
10 Aug 2014, 18:22
Based on the answer choices and the question, this question begs the use of x=5 as a sample number. Initial = 5%*10000 = 500 Reduction = 5-5=0%, so no math required here to calculate the reduction; just make sure that you can calculate 500 in your answer.
A. x*x – 5x = 0; No B. (x)(105 – x) = 500; Winner! C. (100)(105 – x) > 500; No D. (100)(95 – x) > 500; No E. (x-5)/100 = 0; No
B
I was a strong believer in using algebra for percent problems, but after missing 95% of them because of some careless error, I was converted to the sample number method. Generally speaking, picking smart numbers for percent problems will get you the correct answer more quickly and with the least errors.
Re: A certain research group plans to create computer models of [#permalink]
20 Mar 2015, 22:19
suyash23n wrote:
A certain research group plans to create computer models of x% of a list of 10,000 bacterial species known to inhabit the human body. After a budget cut, the group finds it must reduce this selection by (x − 5)%. In terms of x, how many species of bacteria will the group be able to model?
A. x*x – 5x B. (x)(105 – x) C. (100)(105 – x) D. (100)(95 – x) E. (x-5)/100
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