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QUANT DS

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by [email protected] » Wed Sep 07, 2011 9:36 am
Q: X AND Y ARE TWO, 2-DIGITS INTEGERS. WHAT IS THE DIFFERENCE BETWEEN THE TEN'S DIGIT OF X AND TEN'S DIGIT OF Y?

A: X-Y = 27
B: UNIT DIGIT OF X MINUS UNIT DIGIT OF Y IS GREATER THAN 3?
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Source: — Data Sufficiency |
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by cans » Wed Sep 07, 2011 9:59 am
a) x-y=27.
x=38,y=11 diff = 2.
x=41,y=14, diff = 3
insufficient
b) x-y = 27 and unit of x - unit of y >3.
thus (x,y) unit pairs can be: (9,2), (8,1), (7,0)
x=37,y=10. x=47,y=20. diff = 2 always.
Sufficient
IMO C
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by sl750 » Thu Sep 08, 2011 7:34 am
I did it this way

X=10a+b
Y=10c+d
X-Y = 27 so 10(a-c) +b-d =20+7
10(a-c)=20 a-c=2. From this I get a sufficiency. Am I missing something here?
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by prateek_guy2004 » Thu Sep 08, 2011 8:53 am
At a first glance i thought its E but yeah didnt do much calculations ...should be C
Don't look for the incorrect things that you have done rather look for remedies....

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