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If a two-digit positive integer has its digits reversed, the

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If a two-digit positive integer has its digits reversed, the [#permalink] New post 27 Dec 2012, 08:29
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If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 27. By how much do the two digits differ?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7
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Re: If a two-digit positive integer has its digits reversed, the [#permalink] New post 27 Dec 2012, 08:31
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Walkabout wrote:
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 27. By how much do the two digits differ?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7


Given that (10a + b) - (10b + a) = 27 --> 9a - 9b =27 --> a - b = 3.

Answer: A.
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Re: If a two-digit positive integer has its digits reversed, the   [#permalink] 27 Dec 2012, 08:31
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