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Is the number y between 0.3 and 0.6 ?

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Director
Director
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Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 513
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)
Followers: 25

Kudos [?]: 561 [0], given: 630

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:

82% (01:58) correct 18% (01:50) wrong based on 51 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
Expert Post
Math Expert
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Joined: 02 Sep 2009
Posts: 32569
Followers: 5643

Kudos [?]: 68473 [0], given: 9805

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

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New post 25 Oct 2013, 00:26
Expert's post
Director
Director
User avatar
Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 513
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)
Followers: 25

Kudos [?]: 561 [0], given: 630

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.
Re: Is the number y between 0.3 and 0.6 ?   [#permalink] 29 Oct 2013, 22:17
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Is the number y between 0.3 and 0.6 ?

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