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# OG PS - 184

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Senior Manager
Joined: 25 Nov 2006
Posts: 337
Schools: St Gallen, Cambridge, HEC Montreal
Followers: 2

Kudos [?]: 36 [0], given: 0

OG PS - 184 [#permalink]  19 Jun 2007, 10:01
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hello there,

OG PS 184 is

If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N?

A - 181
B - 165
C - 121
D - 99
E - 44

Senior Manager
Joined: 03 Jun 2007
Posts: 384
Followers: 2

Kudos [?]: 10 [0], given: 0

It is actually a simple question. Answer is A

Let the numbers be 10x + y and 10y + x
So their sum is 11(x+y)
only 181 is not a multiple of 11
VP
Joined: 08 Jun 2005
Posts: 1147
Followers: 6

Kudos [?]: 128 [0], given: 0

lumone wrote:
dahcrap wrote:
It is actually a simple question. Answer is A

Let the numbers be 10x + y and 10y + x
So their sum is 11(x+y)
only 181 is not a multiple of 11

How did you come to 10x + y and 10y + x?

in every two digit number (i.e xy) the first digit (i.e x) equal to x*10 and the second digit equal to y*1

81 = 8*10+1*1
55 = 5*10+5*1
6545 = 6*1000+5*100+4*10+5*1

Senior Manager
Joined: 21 Jun 2006
Posts: 287
Followers: 1

Kudos [?]: 30 [0], given: 0

A
All other nos can be split up into two nos with both digits being equal
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