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inequality problem

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Manager
Joined: 28 Jun 2008
Posts: 50
Followers: 0

Kudos [?]: 20 [0], given: 31

inequality problem [#permalink]  09 Jun 2009, 19:40
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hey guys was wondering if anyone could explain a good way to do this problem:

If mv<pv<0, is v<0?

(1) m<p
(2) m<0

Current Student
Joined: 03 Aug 2006
Posts: 116
Followers: 4

Kudos [?]: 150 [1] , given: 3

Re: inequality problem [#permalink]  10 Jun 2009, 09:47
1
KUDOS
Given:

mv<pv<0 ---- (1)

v<0?

Looking at (1) mv and pv are both less than zero.
This means either
m & p are positive and v is negative
or
m & p are negative and v is positive.

Lets look at statement 1.

It tells us m<p
we also know that mv<pv from (1).
The only way we can get m<p is by dividing both sides by v, however we do not change the inequality sign if the number or variable we are dividing by is positive. Hence if we divide both sides by v when v is positive we get m<p. Hence statement 1 is sufficient to tell us that v is not less than 0.

Lets look at statement 2.
It tells us m<0 i.e. m is negative. If m is negative then p is also negative. And if m & p are negative than v has to be positive from (1) Hence v is not less than 0. Statement 2 is sufficient.

Intern
Joined: 04 Mar 2008
Posts: 43
Followers: 0

Kudos [?]: 3 [0], given: 6

Re: inequality problem [#permalink]  10 Jun 2009, 13:35
completely agree with nookway.
Re: inequality problem   [#permalink] 10 Jun 2009, 13:35
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