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# Very simple but very confusing question

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Intern
Joined: 11 Mar 2018
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Very simple but very confusing question [#permalink]  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
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Joined: 18 Apr 2015
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Re: Very simple but very confusing question [#permalink]  12 Mar 2018, 11:53
1
KUDOS
Expert's post

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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Manager
Joined: 26 Jun 2017
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Re: Very simple but very confusing question [#permalink]  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.
_________________

What you think, you become.

Re: Very simple but very confusing question   [#permalink] 22 Mar 2018, 02:03
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