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If xy ≠ 0, what is the value of 1/x + 1/y ?

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V
Joined: 02 Sep 2009
Posts: 42250

Kudos [?]: 132495 [0], given: 12323

If xy ≠ 0, what is the value of 1/x + 1/y ? [#permalink]

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New post 11 Nov 2017, 09:42
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A
B
C
D
E

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Question Stats:

100% (00:50) correct 0% (00:00) wrong based on 34 sessions

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Kudos [?]: 132495 [0], given: 12323

Manager
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B
Joined: 17 Oct 2016
Posts: 87

Kudos [?]: 20 [0], given: 72

Location: India
Concentration: Operations, Strategy
GPA: 3.7
WE: Design (Real Estate)
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Re: If xy ≠ 0, what is the value of 1/x + 1/y ? [#permalink]

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New post 11 Nov 2017, 09:47
B

The question can be rephrased as (x+y)/xy=?

1: we can conclude x+y=-1. Insufficient

2: we can rearrange to give (x+y)/xy=1/6. Sufficient


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Kudos [?]: 20 [0], given: 72

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Kudos [?]: 5 [0], given: 1

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If xy ≠ 0, what is the value of 1/x + 1/y ? [#permalink]

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New post 11 Nov 2017, 10:27
If xy ≠ 0, what is the value of 1/x + 1/y ?

(1) 1/(x + y) = -1

1/(x+y)=-1
=>1=-x-y
=>x+y = -1 (no enough information)
=> Insufficient

(2) xy=6(x+y)

1/x+1/y=(x+y)/xy
xy=6(x+y)
xy/(x+y)=6
=> sufficient

=> answer is B

Kudos [?]: 5 [0], given: 1

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Kudos [?]: 11 [0], given: 20

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Concentration: Finance, Technology
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Re: If xy ≠ 0, what is the value of 1/x + 1/y ? [#permalink]

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New post 11 Nov 2017, 11:26
If xy ≠ 0, what is the value of 1/x + 1/y ?

(1) 1/(x + y) = -1

(2) xy=6(x+y)


Statement 1 doesnt specify xy, hence; insuffucient
Statement 2:Rearranging gives (x+y)/xy=1/6, hence, sufficient

Kudos [?]: 11 [0], given: 20

Re: If xy ≠ 0, what is the value of 1/x + 1/y ?   [#permalink] 11 Nov 2017, 11:26
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