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2x – y =

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vikasp99
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2x – y = [#permalink] New post   06 Mar 2017, 05:08
00:00
A
B
C
D
E

Difficulty:

15% (low)

Question Stats:

83% (00:49) correct 17% (01:58) wrong based on 94 sessions
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2x – y =

(1) 3x + y = x + 2y

(2) (x + y) + 3(x – y) = 0
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Official Answer
D
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KrishnakumarKA1
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Re: 2x – y = [#permalink] New post   06 Mar 2017, 07:19
To get the value of this expression, we need:
1# exact value of x and y
2# two equations in x and y
3# value for the expression 2x-y

Statement analysis
St 1: 3x +y = x +2y or x = y. two variable one equation. INSUFFICIENT
St 2: we get y = 2x. two variable one equation. INSUFFICIENT

St 1 & St 2: two equation two variable. solving we get, x =0 and y = 0. hence the value of the expression is 0. ANSWER

Option C
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Re: 2x – y = [#permalink] New post   12 Sep 2017, 06:05
Can someone explain...
if we solve (x + y) + 3(x – y) = 0 we get 4x=2y , x=1/2y, thus solving for 2x – y should gives us 0 so answer should be B as (1) 3x + y = x + 2y is same as 2x – y...
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Bunuel
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Re: 2x – y = [#permalink] New post   12 Sep 2017, 06:14
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sony1000 wrote:
Can someone explain...
if we solve (x + y) + 3(x – y) = 0 we get 4x=2y , x=1/2y, thus solving for 2x – y should gives us 0 so answer should be B as (1) 3x + y = x + 2y is same as 2x – y...


The question asks to find the value of 2x – y.

2x - y is some number, which cannot be the same as equation 3x + y = x + 2y. When you simplify this equation you'll get that 2x - y = 0, so we know that the value of 2x - y is 0.
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Re: 2x – y = [#permalink] New post   12 Sep 2017, 06:21
Isn't it D?

We have to get the value of 2x - y, which is 0 in both the equations.

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Re: 2x – y = [#permalink] New post   12 Sep 2017, 06:24
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naval2272 wrote:
Isn't it D?

We have to get the value of 2x - y, which is 0 in both the equations.

Sent from my Nexus 5 using GMAT Club Forum mobile app


Yes, the answer is D because both equations give 2x – y = 0.
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Re: 2x – y = [#permalink] New post   12 Sep 2017, 08:19
Find: 2x – y = ?

(1) 3x + y = x + 2y
=> 3x + y - x - 2y =0
=> 2x -y =0
Sufficient

(2) (x + y) + 3(x – y) = 0
=> x+y+3x-3y=0
=>4x-2y=0
=> 2x-y=0
sufficient

So in both cases value of 2x-y=0

Answer: D
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2x – y = [#permalink] New post   12 Sep 2017, 09:30
2x – y =?

1)3x + y = x + 2y
3x+y-x-2y=0
2x-y=0
sufficient.

2)(x + y) + 3(x – y) = 0
x+y+3x-3y=0
4x-2y=0
2(2x-y)=0
2x-y=0
Sufficient.

Hence Answer is Option D.

Kudos if it helps.
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devikeerthan
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2x – y = [#permalink] New post   Updated on: 13 Sep 2017, 05:04
naval2272 wrote:
Isn't it D?

We have to get the value of 2x - y, which is 0 in both the equations.

Sent from my Nexus 5 using GMAT Club Forum mobile app

Yes. D because both equations give 2x – y = 0

Originally posted by devikeerthan on 13 Sep 2017, 04:14.
Last edited by devikeerthan on 13 Sep 2017, 05:04, edited 1 time in total.
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Re: 2x – y = [#permalink] New post   13 Sep 2017, 05:02
ByjusGMATapp wrote:
To get the value of this expression, we need:
1# exact value of x and y
2# two equations in x and y
3# value for the expression 2x-y

Statement analysis
St 1: 3x +y = x +2y or x = y. two variable one equation. INSUFFICIENT
St 2: we get y = 2x. two variable one equation. INSUFFICIENT

St 1 & St 2: two equation two variable. solving we get, x =0 and y = 0. hence the value of the expression is 0. ANSWER

Option C

Total support your approach of doing these questiin via counting variables in the question. But when C become too easy then try D as an answer.

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Re: 2x – y = [#permalink]
13 Sep 2017, 05:02
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Bunuel
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