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Is the number y between 0.3 and 0.6 ?

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Director
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Status: 1,750 Q's attempted and counting
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Kudos [?]: 1015 [0], given: 630

Location: United States (FL)
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GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 24 Oct 2013, 17:24
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

83% (00:59) correct 17% (01:40) wrong based on 70 sessions

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Is the number y between 0.3 and 0.6 ?

(1) 640y < 320
(2) 800y > 320

GH-08.07.13 | OE to follow.
[Reveal] Spoiler: OA

Kudos [?]: 1015 [0], given: 630

Expert Post
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Joined: 02 Sep 2009
Posts: 42270

Kudos [?]: 132821 [1], given: 12378

Re: Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 25 Oct 2013, 00:26
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Kudos [?]: 132821 [1], given: 12378

Director
Director
User avatar
Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 514

Kudos [?]: 1015 [0], given: 630

Location: United States (FL)
Schools: UFL (A)
GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
Re: Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 29 Oct 2013, 22:17
Official Explanation

Answer: C
Statement (1) is insufficient. Simplify the inequality:
640y/640 < 320/640
y < 0.5
y could be between 0.3 and 0.5, but it could also be less than 0.3.

Statment (2) is also insufficient. Again, simplify:
800y/800 > 320/800
y > 0.4
y could be between 0.4 and 0.6, but it could also be greater than 0.6.

Taken together, the statements are sufficient. If y is less than 0.5 and greater than 0.4, it must be between 0.3 and 0.6. Choice (C) is correct.

Kudos [?]: 1015 [0], given: 630

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Re: Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 27 May 2016, 05:10
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Kudos [?]: 283 [0], given: 0

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Re: Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 27 May 2016, 05:48
avohden wrote:
Is the number y between 0.3 and 0.6 ?

(1) 640y < 320
(2) 800y > 320

GH-08.07.13 | OE to follow.


Statement 1

640y < 320
y<0.5

Sufficient.

Statement 2

800y > 320

y > \(\frac{32}{80}\) {\(\frac{32}{80}\) = \(\frac{4}{10}\) = 0.4

y > 0.4

y can be 0.41, in which case it lies between 0.3 and 0.6.

y can be 0.61, in which case it does not lie between 0.3 and 0.6.

So statement (2) is not sufficient.


Option A is the answer

Kudos [?]: 159 [0], given: 9

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Re: Is the number y between 0.3 and 0.6 ? [#permalink]

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New post 27 May 2016, 05:56
adiagr wrote:
avohden wrote:
Is the number y between 0.3 and 0.6 ?

(1) 640y < 320
(2) 800y > 320

GH-08.07.13 | OE to follow.


Statement 1

640y < 320
y<0.5

Sufficient.


Statement 2

800y > 320

y > \(\frac{32}{80}\) {\(\frac{32}{80}\) = \(\frac{4}{10}\) = 0.4

y > 0.4

y can be 0.41, in which case it lies between 0.3 and 0.6.

y can be 0.61, in which case it does not lie between 0.3 and 0.6.

So statement (2) is not sufficient.


Option A is the answer


Hi,

statement I gives you y<0.5...
and Q asked is --- Is the number y between 0.3 and 0.6 ?
if y is 0.4......ans is YES
But if y is 0.2.... ans is NO

so statement I is not sufficient on its own..
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Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5855 [0], given: 117

Re: Is the number y between 0.3 and 0.6 ?   [#permalink] 27 May 2016, 05:56
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