number properties problem

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smallsorrow: Master | Next Rank: 500 Posts; Posts: 109; Joined: Mon Sep 08, 2008 12:47 am

by smallsorrow » Mon Sep 22, 2008 7:07 am

How many integers n are there such that
1< 5n+5 < 5

A) five
B) four
C) three
D) two
E) one

OA follows...

Do you include 0 for n???

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Source: Beat The GMAT — Problem Solving | Mon Sep 22, 2008 7:07 am

stop@800: Legendary Member; Posts: 871; Joined: Wed Aug 13, 2008 7:48 am; Thanked: 48 times

by stop@800 » Mon Sep 22, 2008 7:30 am

Please reverify the question, I think you have done some typo

www.interrogationpoint.com

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toudavis: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Fri Jun 20, 2008 7:36 am

by toudavis » Mon Sep 22, 2008 7:33 am

This one should be solved by solving for the inequality on both sides.

1<5+5n<25
Subtract 5 from both sides, then divide by 5 on both sides.
That leaves you with this:

-4/5<n<4

So the integers that fall in that range are 0,1,2,3

Hope that helps

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smallsorrow: Master | Next Rank: 500 Posts; Posts: 109; Joined: Mon Sep 08, 2008 12:47 am

by smallsorrow » Mon Sep 22, 2008 7:33 am

typo, me --- no way

here we go

it is 1<5n+5<25

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smallsorrow: Master | Next Rank: 500 Posts; Posts: 109; Joined: Mon Sep 08, 2008 12:47 am

by smallsorrow » Mon Sep 22, 2008 7:39 am

Thanks - I just was not sure about 0 ...

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EricLien9122: Master | Next Rank: 500 Posts; Posts: 106; Joined: Thu May 22, 2008 10:50 am; Thanked: 3 times

by EricLien9122 » Mon Sep 22, 2008 8:58 am

0 is consider an integer. So ya, you include 0.

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