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If the tens digit x and the units digit y of a positive

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If the tens digit x and the units digit y of a positive [#permalink] New post 26 Feb 2006, 09:43
If the tens digit x and the units digit y of a positive integer n are
reversed, the resulting integer is 9 more than n. What is y in terms of x ?
(A) 10 - x
(B) 9 - x
(C) x + 9
(D) x - 1
(E) x + 1
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 [#permalink] New post 26 Feb 2006, 10:03
E.

From first statement:
x*10+y=n
When x and y are reversed:
y*10+x=n+9

Solving both equations:
10y+x=10x+y+9
9y=9x+9
y=x+1
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GMAT Tests User
 [#permalink] New post 26 Feb 2006, 18:10
Before reverse n = 10x + y
After reverse number becomes 10y+x --> this is 9 more than n

10y+x-9 = 10x+y
9y = 9x+9
y = x+1

Ans E
  [#permalink] 26 Feb 2006, 18:10
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If the tens digit x and the units digit y of a positive

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