Does y equal 1 ? (1) x = 2y (2) x = 2

Question

Does y equal 1 ?

(1) x = 2y
(2) x = 2

DS21208

GMATinsight · Answer

Is y = ?

Statement 1 : x = 2y

x is unknown and y is dependent on x hence

NOT SUFFICIENT

Statement 2 : x = 2

No information about y hence

NOT SUFFICIENT

COmbining the statements

x - 2 and x = 2y

i.e. y = 1

SUFFICIENT

Answer: Option C

Siak0730 · Answer

statement 1: x=2y
not sufficient as 2 variables x and y and 1 equation
if x=1/2, then y=1
but if x=1 or -1 or 0, y=2, -2, 0 and hence not sufficient

statement 2: x=2
no information about y.
clearly, not sufficient

combining statement 1 and 2 we get
 x=2y, x=2
or 2= 2y or y=1 and hence sufficient 
therefore, C.

Shrinkhla21 · Answer

The answer is C.

Statement 1 simply mentions the relationship between x and y. Thus, we cannot deduce the value of y from it.

Statement 2 has no mention of y whatsoever. Thus, insufficient.

Combining the two, 
X=2 and x=2y we can conclude the value of y which is 1.

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Does y equal 1 ? (1) x = 2y (2) x = 2

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GMAT Data Sufficiency (DS) Questions

Does y equal 1 ? (1) x = 2y (2) x = 2

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