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What is the value of x?

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Source: — Data Sufficiency |
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by ajith » Sat Feb 20, 2010 3:19 am
gmatnmein2010 wrote:What is the value of x?

(1) 2x - 5y + 6 = 12

(2) 8x - (4x + 10y) + 27 = 39
1) not sufficient - 2 variables 1 equation
2) 8x - (4x + 10y) + 27 = 39; 4x -10y = 12; 4x-5y =6 , not sufficient

Combined also not sufficient because 1) and 2) gives the same equation

E
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by thephoenix » Sat Feb 20, 2010 3:23 am
gmatnmein2010 wrote:What is the value of x?

(1) 2x - 5y + 6 = 12

(2) 8x - (4x + 10y) + 27 = 39
(1) INSUFFICIENT:
two variable and one eqn

(2) INSUFFICIENT:
same

(1) AND (2) INSUFFICIENT: bcoz bth are same equation f
The correct answer is E.
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by shashank.ism » Sat Feb 20, 2010 1:36 pm
gmatnmein2010 wrote:What is the value of x?

(1) 2x - 5y + 6 = 12

(2) 8x - (4x + 10y) + 27 = 39
St. 1: 2x - 5y + 6 = 12 two unknown 1 equation ==========insufficient
St. 2: 8x - (4x + 10y) + 27 = 39 --> 4x-10y =12 two unknown 1 equation ==========insufficient

combined :
from statement 1 eq is 2x - 5y + 6 = 12 --> 2x-5y = 6
from statement 1 eq is 8x - (4x + 10y) + 27 = 39 --> 4x-10y =12 --> 2x-5y =6
both eq are same
so we can't calculate
insuff.

Ans E
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