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DS - x+y

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DS - x+y

by karthikpandian19 » Mon Dec 05, 2011 10:43 pm
What is the value of x ?

(1) xy= 6

(2) x + y= 5
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by Anurag@Gurome » Mon Dec 05, 2011 10:59 pm
karthikpandian19 wrote:What is the value of x ?

(1) xy= 6

(2) x + y= 5
(1) xy = 6 is alone NOT sufficient as we do not y.
(2) x + y = 5 is again NOT sufficient as there is one equation and 2 variables x and y.

Combining (1) and (2), we get x + 6/x = 5
x² - 5x + 6 = 0
(x - 3)(x - 2) = 0 or x = 2, 3
We do not get a definite answer as there are 2 values of x; NOT sufficient.

The correct answer is E.
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by CollegeKart » Tue Dec 06, 2011 7:53 pm
Answer is E
1. two unknown variables x and y. hence insufficient
2. two unknown variables x and y. hence insufficient

Combine 1 & 2
(y/6)+y=5. solving we get 2 values. hence insufficient
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