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# Three spies—Ex, Why, and Zee— together know 19 different secrets. Ther

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Math Expert
Joined: 02 Sep 2009
Posts: 51100
Three spies—Ex, Why, and Zee— together know 19 different secrets. Ther  [#permalink]

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22 Jan 2016, 09:18
00:00

Difficulty:

(N/A)

Question Stats:

50% (00:53) correct 50% (00:00) wrong based on 8 sessions

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Three spies—Ex, Why, and Zee— together know 19 different secrets. There is no overlap of information. How many secrets does Why know?

(1) Ex knows one more than Why and twice as many as Zee.
(2) Why knows three more secrets than Zee.

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Senior Manager
Joined: 11 Nov 2014
Posts: 334
Location: India
WE: Project Management (Telecommunications)
Re: Three spies—Ex, Why, and Zee— together know 19 different secrets. Ther  [#permalink]

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22 Jan 2016, 11:21
S1 1
x=y+1
x=2z
we know together there are 19
i.e. x-y-z =
4,7,8

S2
all we know is
y = z + 3
but we need to know x's part
Not suff

Ans A
Re: Three spies—Ex, Why, and Zee— together know 19 different secrets. Ther &nbs [#permalink] 22 Jan 2016, 11:21
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