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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: 20

Kudos [?]: 262 [0], given: 629

Is the number y between 0.3 and 0.6 ? [#permalink] New post 24 Oct 2013, 16:24
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

82% (02:02) correct 18% (01:18) wrong based on 44 sessions
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

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Kudos [?]: 26673 [0], given: 2714

Re: Is the number y between 0.3 and 0.6 ? [#permalink] New post 24 Oct 2013, 23:26
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: 20

Kudos [?]: 262 [0], given: 629

Re: Is the number y between 0.3 and 0.6 ? [#permalink] New post 29 Oct 2013, 21:17
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.
_________________

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Re: Is the number y between 0.3 and 0.6 ?   [#permalink] 29 Oct 2013, 21:17
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Is the number y between 0.3 and 0.6 ?

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