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paidlukkha
Joined: 11 Nov 2014
Last visit: 21 Apr 2017
Posts: 250
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Location: India
Concentration: Finance, International Business
Schools: ISB '18 Great Lakes '18 SPJ PGPM"17 LBS '18 NTU '18 NUS '18
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Updated on: 30 May 2025, 06:30
Originally posted by paidlukkha on 26 Jan 2016, 10:30.
Last edited by Bunuel on 30 May 2025, 06:30, edited 3 times in total.
Last edited by Bunuel on 30 May 2025, 06:30, edited 3 times in total.
RENAMED THE TOPIC.
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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:
5%
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Question Stats:
82% (00:58) correct
18%
(01:15)
wrong
based on 876
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Which of the following is closest to the value of \(\frac{999}{100+\frac{1}{999}}\)?
A. 10
B. 1
C. 0.1
D. 0.01
E. 0.001
A. 10
B. 1
C. 0.1
D. 0.01
E. 0.001
Updated on: 14 Apr 2022, 14:55
Originally posted by BrentGMATPrepNow on 26 Jan 2016, 13:09.
Last edited by BrentGMATPrepNow on 14 Apr 2022, 14:55, edited 2 times in total.
Last edited by BrentGMATPrepNow on 14 Apr 2022, 14:55, edited 2 times in total.
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paidlukkha
This question is a great example of using the answer choices to our advantage.
When we check the answer choices, we see that we have a gigantic spread.
For example, 10 is 900% greater than 1, which is 900% greater than 0.1, which is 900% greater than 0.01, which is 900% greater than 0.001.
In comparison to the significant differences between each answer choice, I'm going to make some a incredibly minor changes to the values in our calculation.
\(\frac{999}{100+\frac{1}{999}} ≈ \frac{1000}{100} ≈ 10\)
Answer: A
Aside:
Changing \(999\) to \(1000\) represents a change of approximately 0.1%
Similarly, changing \(100+\frac{1}{999}\) to \(100\) represents a change of approximately 0.001%.
26 Jan 2016, 12:53
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Good exercise in approximation.
We can approximate the numerator to be 1000.
For the denominator, 1/999 is MUCH less than 100, so we can disregard it completely. (1/999 = 0.001001..., so 100.001 ≈ 100)
The expression now becomes 1000/100 = 10
Answer: A
We can approximate the numerator to be 1000.
For the denominator, 1/999 is MUCH less than 100, so we can disregard it completely. (1/999 = 0.001001..., so 100.001 ≈ 100)
The expression now becomes 1000/100 = 10
Answer: A
