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If A and B are consecutive positive integers less than 100

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Intern
Intern
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Joined: 08 Dec 2012
Posts: 7

Kudos [?]: 19 [0], given: 8

Location: United States
Concentration: Finance, Strategy
GMAT 1: 760 Q48 V48
GPA: 3.71
WE: Sales (Energy and Utilities)
If A and B are consecutive positive integers less than 100 [#permalink]

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New post 05 Apr 2013, 22:23
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

71% (00:50) correct 29% (00:25) wrong based on 59 sessions

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If A and B are consecutive positive integers less than 100, what is the value of B?

(1) A is the cube of an integer.
(2) B is the square of an integer.
[Reveal] Spoiler: OA

Kudos [?]: 19 [0], given: 8

Intern
Intern
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Status: Attending Duke in May!
Joined: 08 Jan 2013
Posts: 29

Kudos [?]: 43 [0], given: 18

Location: United States (NC)
Concentration: Leadership, Strategy
GMAT 1: 640 Q42 V35
Re: If A and B are consecutive positive integers less than 100 [#permalink]

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New post 05 Apr 2013, 23:13
Nichols wrote:
If A and B are consecutive positive integers less than 100, what is the value of B?

1. A is the cube of an integer.
2. B is the square of an integer.



1.) Insufficient, doesn't tell us anything about B.

This statement implies cube root of A<5. \(5^3=125\), \(4^3=64\).

2.) Insufficient, this statement tells us \(\sqrt{B}<10\).

1&2.) Sufficient. Taken together cube root of A<5 and \(\sqrt{B}<10\) AND consecutive integers, the only values that meet the given conditions are \(A=2^3=8\) and \(B=3^2=9\)

Kudos [?]: 43 [0], given: 18

Senior Manager
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Joined: 16 Dec 2011
Posts: 418

Kudos [?]: 240 [0], given: 70

Re: If A and B are consecutive positive integers less than 100 [#permalink]

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New post 05 Apr 2013, 23:21
1. A can be 1, 8, 27, or 64. B can be 1, 7, 9, 26, 28, 63, or 65. Not Sufficient.
2. B can be 1, 4, 9, 16, 25, 36, 49, 64, or 81. Not sufficient.

Together: Only 8 and 9 are consecutive cube and square numbers. So B is 9. Sufficient.

Answer is C.

Kudos [?]: 240 [0], given: 70

Re: If A and B are consecutive positive integers less than 100   [#permalink] 05 Apr 2013, 23:21
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If A and B are consecutive positive integers less than 100

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