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22 Jan 2016, 10:18
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
82% (01:16) correct
18%
(02:03)
wrong
based on 22
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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.
(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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22 Jan 2016, 12:21
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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
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
05 Apr 2020, 09:32
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Bunuel
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.
(1) Ex knows one more than Why and twice as many as Zee.
(2) Why knows three more secrets than Zee.
Solution
Step 1: Analyse Question Stem
- • Ex, Why, and Zee know 19 different secrets.
- o Let us assume that Ex, Why and Zee know x, y and z secrets, respectively.
- o This means, \(x + y + z = 19 ………Eq. (i)\)
Step 2: Analyse Statements Independently (And eliminate options) – AD/BCE
Statement 1: Ex knows one more than Why and twice as many as Zee.
- • According to this statement : \(x = y+1\) and
- o \( x =2z⟹ z =\frac{x}{2} = \frac{(y + 1)}{2}\)
- o \((y+1) + y +\frac{(y+1)}{2 }= 19\)
Hence, statement 1 is sufficient and we can eliminate answer Options B, C and E.
Statement 2: Why knows three more secrets than Zee.
- • According to this statement;\( y = z+3\)
• This statement neither gives any information about x nor it gives the exact value of z. Thus, we cannot determine the value of y from this statement alone.
Thus, the correct answer is Option A.
