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If P, Q and R are points on the number line, what is the distance betw

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If P, Q and R are points on the number line, what is the distance betw  [#permalink]

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New post 24 Sep 2018, 06:06
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  35% (medium)

Question Stats:

67% (00:47) correct 33% (00:57) wrong based on 24 sessions

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If P, Q and R are points on the number line, what is the distance between Q and R?

(1) The points P and Q are 20 units’ apart.
(2) The points P and R are 25 units’ apart.

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Re: If P, Q and R are points on the number line, what is the distance betw  [#permalink]

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New post 24 Sep 2018, 11:57
Bunuel wrote:
If P, Q and R are points on the number line, what is the distance between Q and R?

(1) The points P and Q are 20 units’ apart.
(2) The points P and R are 25 units’ apart.


Statement 1: No nothing about R.
INSUFFICIENT

Statement 2: No nothing about Q
INSUFFICIENT

Statement 1 & 2) Goal is to see if you can prove insufficiency. To do this you just need to come up with two examples where Q & R are different distances from each other.

Example 1: P = 0, Q = 20, R = 25. ----> Q & R are 5 units apart

Example 2: P = 0, Q = 20, R = -25 ----> Q & R are 45 units apart.

INSUFFICIENT

Answer: E
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Re: If P, Q and R are points on the number line, what is the distance betw &nbs [#permalink] 24 Sep 2018, 11:57
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