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If [x] denotes the greatest integer less than or equal to x [#permalink]
23 May 2010, 08:06

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Difficulty:

15% (low)

Question Stats:

79% (01:39) correct
21% (00:39) wrong based on 323 sessions

If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ?

(1) 5x + 1 = 3 + 2x

(2) 0 < x < 1

hello GMAT guy!!

well i m confused about a certain problem [ 100th data sufficieny on OG 12th ed] here they define x as a integer but in the explanation they solve it as if x is is a fraction not an integer...can any one have better explanation...

Re: How x become fraction if its been said an integer [#permalink]
23 May 2010, 08:30

1

This post received KUDOS

musabber wrote:

hello GMAT guy!!

well i m confused about a certain problem [ 100th data sufficieny on OG 12th ed] here they define x as a integer but in the explanation they solve it as if x is is a fraction not an integer...can any one have better explanation...

If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ?[data suff prob number 100 from OG 12th edition]

(1) 5x + 1 = 3 + 2x

(2) 0 < x < 1

x is not defined as an integer here. the function [x] is defined as an integer, therefore x can be a fraction

[4] = 4 [4.9] = 4 [3/2] = 1

get it? _________________

If you like my post, a kudos is always appreciated

Re: How x become fraction if its been said an integer [#permalink]
23 May 2010, 09:40

3

This post received KUDOS

Expert's post

musabber wrote:

hello GMAT guy!!

well i m confused about a certain problem [ 100th data sufficieny on OG 12th ed] here they define x as a integer but in the explanation they solve it as if x is is a fraction not an integer...can any one have better explanation...

If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ?[data suff prob number 100 from OG 12th edition]

(1) 5x + 1 = 3 + 2x

(2) 0 < x < 1

If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ?

Here x is not said to be an integer. Stem defines some function, represented by the symbol [], as the function which rounds down any number to an integer value:

If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ? (1) 5x + 1 = 3 + 2x (2) 0 < x < 1

The answer mentions that this [x] = 0 is equivalent to 0 ≤ x < 1.

I have hard time understanding it.

What would be [x] = 5 ?

5 <= x < 6 ???

Merging similar topics. Please refer to the solution above.

As for your question: If [x]=5 then yes, 5\leq{x}<6, as ANY x from this range if round down to the integer gives 5. The same way if [x]=0 then 0\leq{x}<1, as ANY x from this range if round down to the integer gives 0.

Re: How x become fraction if its been said an integer [#permalink]
29 Oct 2010, 21:02

Thanks Bunuel for the answer & merging my question with other questions. I understand the the lower limit but find it hard to grasp the upper limit. can the upper limit always be x+1 for [x] ?

Re: How x become fraction if its been said an integer [#permalink]
31 Oct 2010, 08:47

Expert's post

lordspace wrote:

Thanks Bunuel for the answer & merging my question with other questions. I understand the the lower limit but find it hard to grasp the upper limit. can the upper limit always be x+1 for [x] ?

No upper limit is not x+1 for [x]. For example if [x]=5 then x<6 because if it's more than or equal to 6 then 5 won't be the greatest integer less than or equal to x.

Re: If [x] denotes the greatest integer less than or equal to x [#permalink]
18 Dec 2012, 00:12

What value of x would give [x]=0? According to the rule given in the problem: [x] denotes the greatest integer less than or equal to x. 0<= x < 1will give us [x] = 0.

(1) 5x + 1 = 3 + 2x 3x = 2 x = 2/3 which satisfies 0 <= x < 1 Thus SUFFICIENT.

Re: If [x] denotes the greatest integer less than or equal to x [#permalink]
21 May 2014, 06:18

Why bother solve statement-1? From st-1 we can tell that we will get the exact value of 'x' for sure and that's all we need to answer the question one way or the other. So sufficient. Is my logic right mods? _________________

Please consider giving 'kudos' if you like my post and want to thank

Re: If [x] denotes the greatest integer less than or equal to x [#permalink]
21 May 2014, 06:23

Expert's post

MensaNumber wrote:

Why bother solve statement-1? From st-1 we can tell that we will get the exact value of 'x' for sure and that's all we need to answer the question one way or the other. So sufficient. Is my logic right mods?