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What is the value of xyz? (1) xy + 1 = 2 (2) yz – 1 = –1

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Math Expert
Joined: 02 Sep 2009
Posts: 42249

Kudos [?]: 132606 [0], given: 12326

What is the value of xyz? (1) xy + 1 = 2 (2) yz – 1 = –1 [#permalink]

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06 Aug 2017, 09:00
00:00

Difficulty:

25% (medium)

Question Stats:

72% (00:39) correct 28% (00:22) wrong based on 37 sessions

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What is the value of xyz?

(1) xy + 1 = 2
(2) yz – 1 = –1
[Reveal] Spoiler: OA

_________________

Kudos [?]: 132606 [0], given: 12326

Director
Joined: 25 Feb 2013
Posts: 542

Kudos [?]: 246 [0], given: 33

Location: India
Schools: Mannheim"19 (S)
GPA: 3.82
Re: What is the value of xyz? (1) xy + 1 = 2 (2) yz – 1 = –1 [#permalink]

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06 Aug 2017, 09:04
Bunuel wrote:
What is the value of xyz?

(1) xy + 1 = 2
(2) yz – 1 = –1

Statement 1: implies that $$xy = 1$$. but provides no value for $$z$$. hence insufficient

Statement 2: implies that $$yz = 0$$. therefore $$xyz = 0$$. Sufficient

Option B

Kudos [?]: 246 [0], given: 33

Re: What is the value of xyz? (1) xy + 1 = 2 (2) yz – 1 = –1   [#permalink] 06 Aug 2017, 09:04
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