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Very simple but very confusing question

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Intern
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Very simple but very confusing question [#permalink] New post 11 Mar 2018, 08:05
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Question Stats:

42% (00:34) correct 57% (00:18) wrong based on 7 sessions
Hi all, I’m confused with the following question so further explanation
Is appreciated :

If 4x-12≥x+9, which of the following must be true?
(A) X>6
(B) X<7
(C) X>7
(D) X>8
(E) X<8


My answer is C and D ,,, but the book’s answer is A
I see that x>6 could be 6.5 so it’s not true and he didn’t
mention it’s an integer in the question. So C,D must be true.
Am I wrong ?
And does the question which of the following must be true point
To selecting one answer or it is possible to select multiple answers?
(Manhattan book)
[Reveal] Spoiler: OA
1 KUDOS received
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Re: Very simple but very confusing question [#permalink] New post 12 Mar 2018, 11:53
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Expert's post
Please follow the rule for posting on the board here

https://greprepclub.com/forum/rules-for ... -1083.html

Also, post the question on the right forum. this is not quantitative comparison question but single answer choice.

moreover, you have to use a proper tag to identify the question. In this case, the source and so on. Look here for further clarification

https://greprepclub.com/forum/qq-how-to ... -2357.html

Back to the question

It asks for \(4x-12 \geq x+9\)

Now \(3x \geq 21\) ; \(x \geq 7\)

X is greater than 7 OR equal to seven. Of the answer choices, B and E are not good.

A. \(x > 6\) this is the right answer

C. \(x > 7\) this is wrong because is true that \(x > 7\) BUT also equal to seven

D. \(x > 8\) this is also wrong because it says that x >8 and as it turns out does not take in account the values prior 8.

Hope now is clear.

Regards
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Re: Very simple but very confusing question [#permalink] New post 22 Mar 2018, 02:03
But if X is greater or equal to 7, how can we choose x>6 as the right answer. There is a infinity of number between the numbers 6 and 7, and x can at least be 7 not below.
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Re: Very simple but very confusing question   [#permalink] 22 Mar 2018, 02:03
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Very simple but very confusing question

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