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by mgmt_gmat » Fri Feb 12, 2010 2:37 am
If n is a positive integer, which of the following is a possible value of |56 - 5n|?
A. 7
B. 9
C. 12
D. 15
E. 20
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by sanju09 » Fri Feb 12, 2010 4:59 am
mgmt_gmat wrote:If n is a positive integer, which of the following is a possible value of |56 - 5n|?
A. 7
B. 9
C. 12
D. 15
E. 20
56 minus a multiple of 5, (5 n in this case) will have 6 or 1 at unit’s place if 56 > 5 n; but it would have 9 or 4 at unit’s place if 56 < 5 n. Hence, 1, 4, 6, and 9 are the possibilities for the unit’s place of the answer of |56 - 5n|, and only [spoiler]9[/spoiler] is there in the choices.

[spoiler]B[/spoiler]
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by ajith » Fri Feb 12, 2010 11:14 am
mgmt_gmat wrote:If n is a positive integer, which of the following is a possible value of |56 - 5n|?
A. 7
B. 9
C. 12
D. 15
E. 20
D & E are multiples of 5 and are not possible..
7 is not possible when 5n is less than 56 ; 7 is not possible when 5n is more than 56 either

[spoiler]9 is possible whe 5n is 65
B[/spoiler]
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