possible value

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Sat Dec 19, 2009 10:03 am

Hi there,

I pick E but the OA is [spoiler]B
[/spoiler]

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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Source: Beat The GMAT — Problem Solving | Sat Dec 19, 2009 10:03 am

homersimpson: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Tue Aug 18, 2009 8:50 pm; Location: Delhi India; Thanked: 1 times

by homersimpson » Sat Dec 19, 2009 10:11 am

I just put in values like

n=10, 11, 12 and then 13 and now 13x5=65

and 56-65= -9 and mod - 9 is positive 9 so B.

I found this to be the easiest way.

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Xbond: Master | Next Rank: 500 Posts; Posts: 275; Joined: Wed Jul 02, 2008 4:19 am; Thanked: 4 times

by Xbond » Sat Dec 19, 2009 10:27 am

thks, I start fom 1 to 10 and I stop it. why do you start at 10 ?

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homersimpson: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Tue Aug 18, 2009 8:50 pm; Location: Delhi India; Thanked: 1 times

by homersimpson » Sat Dec 19, 2009 10:58 am

see mine was a hit and trial methid, the mod just clicked me I thought I have to take the value of the expression in negative and that only starts with 12 onwards.

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