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31 Oct 2010, 17:59
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
52% (02:12) correct
48%
(02:06)
wrong
based on 110
sessions
History
Date
Time
Result
Not Attempted Yet
Hey guys,
I was just doing the Knewton's diagnostic test and found this question to be awkwardly worded, which made me miss the correct answer.
A certain computer has 2,000 megabytes of memory. Memory is considered "free" unless it is being used to run [highlight]either[/highlight] the programs or the operating system, in which case it is called "in use." Are more than 500 megabytes "free"?
1. The total memory in use is 5 times the memory being used to run the operating system.
2. The amount of memory being used to run the programs is less than the amount of memory that is free.
I chose statement (B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
The reason i chose B is because i assumed that only one memory can be used at a time, because they say that "In use memory is EITHER the programs OR the operating system." If this is true, then the amount of free memory must be at least 1001 MB and In Use memory at most 999 MB. This would imply that, yes, there are more than 500 MB of free memory available.
They say C is correct because they assume that both memories CAN be used at the same time. Am i seeing this wrong, or did they word it wrongly?
I was just doing the Knewton's diagnostic test and found this question to be awkwardly worded, which made me miss the correct answer.
A certain computer has 2,000 megabytes of memory. Memory is considered "free" unless it is being used to run [highlight]either[/highlight] the programs or the operating system, in which case it is called "in use." Are more than 500 megabytes "free"?
1. The total memory in use is 5 times the memory being used to run the operating system.
2. The amount of memory being used to run the programs is less than the amount of memory that is free.
I chose statement (B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
The reason i chose B is because i assumed that only one memory can be used at a time, because they say that "In use memory is EITHER the programs OR the operating system." If this is true, then the amount of free memory must be at least 1001 MB and In Use memory at most 999 MB. This would imply that, yes, there are more than 500 MB of free memory available.
They say C is correct because they assume that both memories CAN be used at the same time. Am i seeing this wrong, or did they word it wrongly?
31 Oct 2010, 18:31
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MisterEko
I think your understanding of the wording is wrong. "Memory is considered "free" unless it is being used to run either the programs or the operating system" doesn't mean that memory can be used for only programs or for only OS, it can be used to run both. In this case answer is C:
Given: total=2,000. Question: is free memory>500?
(1) The total memory in use is 5 times the memory being used to run the operating system --> \(OS+programs=5*OS\) --> \(programs=4*OS\). Clearly insufficient.
(2) The amount of memory being used to run the programs is less than the amount of memory that is free --> \(programs<free\). Also insufficient.
(1)+(2) \(total=free+OS+programs\) --> \(2,000=free+\frac{programs}{4}+programs\) --> \(8,000=4*free+5*programs\) --> \(5*programs=8,000-4*free\). As from (2) \(programs<free\) or \(5*programs<5*free\) then: \(8,000-4*free<5*free\) --> \(8,000<9*free\) --> \(free>\frac{8,000}{9}>500\). Sufficient.
Answer: C.
31 Oct 2010, 18:54
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Bunuel
Thank you. I am still struggling with those words, "either" and "or." I was pretty sure that, when used in this way, they are mutually exclusive.
