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505-555 Level|   Geometry|                        
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Bunuel
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Here is a visual that should help.
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Screen Shot 2016-03-27 at 7.44.30 PM.png
Screen Shot 2016-03-27 at 7.44.30 PM.png [ 87.61 KiB | Viewed 40021 times ]

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Bunuel
What is the perimeter of isosceles triangle MNP?

(1) MN = 16
(2) NP = 20

Statement One Alone:

MN = 16

Since we don’t know anything about NP and MP, statement one alone is not sufficient.

Statement Two Alone:

NP = 20

Since we don’t know anything about MN and MP, statement two alone is not sufficient.

Statements One and Two Together:

With two statements together, we know that MN = 16 and NP = 20. Since triangle MNP is isosceles, MP could be 16 or it could be 20. If MP is 16, then the perimeter is 16 x 2 + 20 = 52. However, if MP is 20, then the perimeter is 20 x 2 + 16 = 56. Since we don’t have a unique number for the perimeter, the two statements together are still not sufficient to answer the question.

Answer: E
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Bunuel
What is the perimeter of isosceles triangle MNP?

(1) MN = 16
(2) NP = 20

Similar question to practice: Similar question to practice: https://gmatclub.com/forum/what-is-the-p ... 34505.html
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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