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What is the value of positive number a?

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 41873

Kudos [?]: 128601 [0], given: 12180

What is the value of positive number a? [#permalink]

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New post 08 Dec 2016, 13:58
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

60% (00:30) correct 40% (00:35) wrong based on 52 sessions

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Kudos [?]: 128601 [0], given: 12180

Director
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P
Joined: 05 Mar 2015
Posts: 964

Kudos [?]: 287 [0], given: 41

Re: What is the value of positive number a? [#permalink]

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New post 08 Dec 2016, 20:11
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Bunuel wrote:
What is the value of positive number a?

(1) 2a = a^2
(2) a + 2 = 2a



since a is positive number a>0
we can cancel a in both cases

(1) 2a=a^2

a=2...suff

(2) a + 2 = 2a
a=2----suff

Ans D

Kudos [?]: 287 [0], given: 41

Manager
Manager
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Joined: 21 Jul 2017
Posts: 80

Kudos [?]: 8 [0], given: 59

Location: India
Concentration: Social Entrepreneurship, Leadership
GMAT 1: 750 Q51 V41
GPA: 4
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Re: What is the value of positive number a? [#permalink]

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New post 21 Sep 2017, 19:35
Since a is positive, from statement 1 value is 2.
We discard the value 0 for a.

Kudos [?]: 8 [0], given: 59

Intern
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Joined: 23 Aug 2017
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Kudos [?]: 0 [0], given: 10

What is the value of positive number a? [#permalink]

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New post 25 Sep 2017, 00:40
Bunuel wrote:
What is the value of positive number a?

(1) 2a = a^2
(2) a + 2 = 2a


Since 0 is considered as neither negative nor positive shouldn't we also consider a=0?

Kudos [?]: 0 [0], given: 10

Expert Post
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Joined: 02 Sep 2009
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Kudos [?]: 128601 [1], given: 12180

Re: What is the value of positive number a? [#permalink]

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New post 25 Sep 2017, 00:42
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Expert's post
Jagwant01 wrote:
Bunuel wrote:
What is the value of positive number a?

(1) 2a = a^2
(2) a + 2 = 2a


Since 0 is considered as neither negative nor positive shouldn't we also consider a=0?


Notice that the stem says that a is a positive number: What is the value of positive number a?
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Kudos [?]: 128601 [1], given: 12180

Re: What is the value of positive number a?   [#permalink] 25 Sep 2017, 00:42
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