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by gbb » Sat Mar 28, 2009 3:28 pm
X and Y are both prime numbers. Determine X.

(i) x-y=2
(ii)x^2 - y^2 = 120

answer c
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Source: — Data Sufficiency |
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by cramya » Sat Mar 28, 2009 3:36 pm
Stmt I

x=5 y=3

x=7 y=5

INSUFF

Stmt II

x=13 y=7
x=17 y=13

INSUFF

Together

x-y = 2

x^2-y^2 = 120

(x+y) (x-y) = 120

x+y = 60

2 equations 2 variables can solve for one single value for x

SUFF

Choose C
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