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number properties

by Night reader » Mon Nov 29, 2010 10:01 pm
If the two-digit integers P and Q are positive and have the same digits, but in reverse order, which of the following could be
the difference between P and Q?

(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
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by beat_gmat_09 » Mon Nov 29, 2010 10:16 pm
Night reader wrote:If the two-digit integers P and Q are positive and have the same digits, but in reverse order, which of the following could be
the difference between P and Q?

(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
10x+y
10y+x
10x+y-10y-x
9x-9y
9(x-y)
Difference should be multiple of 9
Option E
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by Night reader » Mon Nov 29, 2010 10:21 pm
beat_gmat_09 wrote:
Night reader wrote:If the two-digit integers P and Q are positive and have the same digits, but in reverse order, which of the following could be
the difference between P and Q?

(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
10x+y
10y+x
10x+y-10y-x
9x-9y
9(x-y)
Difference should be multiple of 9
Option E
you nailed it :)
My knowledge frontiers came to evolve the GMATPill's methods - the credited study means to boost the Verbal competence. I really like their videos, especially for RC, CR and SC. You do check their study methods at https://www.gmatpill.com
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