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XY problem with RS

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Source: — Data Sufficiency |

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by Anurag@Gurome » Tue Dec 13, 2011 12:21 am
karthikpandian19 wrote:Is x - y > r - s?

(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6.
(1) x > r and y < s
x > r and -y > -s
Adding the inequalities, x - y > r - s; SUFFICIENT.

(2) y = 2, s = 3, r = 5, and x = 6
x - y = 6 - 2 = 4
r - s = 5 - 3 = 2
So, x - y > r - s; SUFFICIENT.

The correct answer is D.
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by rijul007 » Tue Dec 13, 2011 12:21 am
Is x - y > r - s?

Is x + s > r + y ?

(1) x > r and y < s?

sum of x and s will be greater than sum of r and y
Sufficient

(2) y = 2, s = 3, r = 5, and x = 6.
Plug in nos
Is 6-2 > 5-3?

Sufficient

Option D
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