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GRE Prep Club Legend  Joined: 07 Jun 2014
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GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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3x + 6y = 27.... x + 2y + z = 11 [#permalink]
Expert's post 00:00

Question Stats: 64% (00:26) correct 35% (01:28) wrong based on 28 sessions
3x + 6y = 27
x + 2y + z = 11

 Quantity A Quantity B z + 5 x + 2y – 2

A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

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Sandy
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Re: 3x + 6y = 27.... x + 2y + z = 11 [#permalink]
1
KUDOS
sandy wrote:
3x + 6y = 27
x + 2y + z = 11

 Quantity A Quantity B z + 5 x + 2y – 2

A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

From 1st equation we have

3x + 6y = 27

or x + 2y = 9 (dividing by 3)

From equation 2, we have

x + 2y + z = 11

or z = 2 (since we got x + 2y = 9; from equation 1)

Now statement 1; putting the value of z

Z + 5 = 2 + 5 =7

Now statement 1; putting the value of x + 2y

x + 2y - 2 = 9 - 2 = 7

Hence Statement 1 = Statement 2 i.e. option C
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Re: 3x + 6y = 27.... x + 2y + z = 11 [#permalink]
1
KUDOS
3x+6y=27 -> x+2y=9 -> z=11-(x+2y)=2 -> z+5=x+2y-2 -> C
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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 105

Kudos [?]: 1782 , given: 397

Re: 3x + 6y = 27.... x + 2y + z = 11 [#permalink]
Expert's post
Explanation

This question may at first look difficult, as there are three variables and only two equations.

However, notice that the top equation can be divided by 3, yielding x + 2y = 9. This can be plugged into the second equation:

(x + 2y) + z = 11

(9) + z = 11

z = 2

Quantity A is thus 2 + 5 = 7. For Quantity B, remember that x + 2y = 9. Thus, Quantity B is 9 – 2 = 7.

The two quantities are equal.
_________________

Sandy
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Try our free Online GRE Test Re: 3x + 6y = 27.... x + 2y + z = 11   [#permalink] 18 Jul 2018, 07:11
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