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DIGITS DS

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by cramya » Fri Nov 14, 2008 6:06 pm
What is the 2 digit number whose first digit is a and whose second digit is b? The number is greater than 9

(1) 2a+3b = 11a+2b
(2) The two digit number is a multiple of 19

[spoiler]OA: A[/spoiler]
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Source: — Data Sufficiency |
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Re: DIGITS DS

by iamcste » Fri Nov 14, 2008 6:16 pm
cramya wrote:What is the 2 digit number whose first digit is a and whose second digit is b? The number is greater than 9

(1) 2a+3b = 11a+2b
(2) The two digit number is a multiple of 19

[spoiler]OA: A[/spoiler]
stmt 1

b=9a

If a =1, b=9 hence, 19

If a =2, b=18 this is not possible since a and b are digits of two digit no and hence individually have to be single digit

hence a=1, b=9 is the only possibility

sufficient

stmt 2

multiple of 19

stem: >9


there are many nos like 19, 38, 57, 76.....not unique and hence not sufficien

A
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by logitech » Fri Nov 14, 2008 6:17 pm
Agreed.
LGTCH
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by cramya » Fri Nov 14, 2008 6:26 pm
Iamcaste u r right on the money.

More tougher DS to follow hopefully....
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