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# what is the two digit number? 1. the difference between the

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Director
Joined: 12 Oct 2008
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what is the two digit number? 1. the difference between the [#permalink]

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18 Aug 2009, 19:20
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38% (02:02) correct 63% (01:00) wrong based on 11 sessions

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what is the two digit number?

1. the difference between the two digits is 9
2. the sum of the digits is equal to the difference between the two digits.
[Reveal] Spoiler:
OA is C....IMO it should be A
SVP
Joined: 29 Aug 2007
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18 Aug 2009, 19:27
what is the two digit number?

1. the difference between the two digits is 9
2. the sum of the digits is equal to the difference between the two digits.
[Reveal] Spoiler:
OA is C....IMO it should be A

A. only 9 and 0 has difference 9. because digits are considered negative. It is 90 but it is not 09 because 9 is never written as 09.

1. suff.
2. nsf. any integer with 0 fits to the statement 2.
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Manager
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18 Aug 2009, 20:17
Agree it should be A.

Only 90 satisfies the statement 1. Hence it should be sufficient.

What is the source and is there any OE, so we can verify if we are missing anything?
Director
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18 Aug 2009, 20:32
It is a R. S Aggrawal book. I got lots of ambiguous DS questions in that book.

Nyways thanks for your help guys.
sdrandom1 wrote:
Agree it should be A.

Only 90 satisfies the statement 1. Hence it should be sufficient.

What is the source and is there any OE, so we can verify if we are missing anything?
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Re: what is the two digit number? 1. the difference between the [#permalink]

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02 Dec 2011, 23:03
+1 A

In (2), the number may be 10, 20, 30,...., and 90.
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Manager
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Kudos [?]: 9 [0], given: 8

Re: what is the two digit number? 1. the difference between the [#permalink]

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05 Dec 2011, 05:55
Should be A... Only 9 and 0 satisfy the set condition
Director
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Re: what is the two digit number? 1. the difference between the [#permalink]

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05 Dec 2011, 18:59
+1 for A.
Let ab be the two digit no
I) difference is 9 = > a - b = 9 (since its a two digit no => a,b > 0 AND a > b) => a = 9 and b = 0 and the two digit no is 90. Hence Sufficient.

II) a-b = a + b => b = 0. 20, 30, ...,90 satisfy this condition. Not Sufficient.

Crick
Re: what is the two digit number? 1. the difference between the   [#permalink] 05 Dec 2011, 18:59
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