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What is the perimeter of a rectangle with length L and width w

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What is the perimeter of a rectangle with length L and width w [#permalink]

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New post 14 Jan 2017, 07:19
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Question Stats:

65% (00:21) correct 35% (00:21) wrong based on 55 sessions

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What is the perimeter of a rectangle with length L and width w?

(1) L-W = 15

(2) L+W = 35
[Reveal] Spoiler: OA

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Re: What is the perimeter of a rectangle with length L and width w [#permalink]

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New post 14 Jan 2017, 09:48

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Re: What is the perimeter of a rectangle with length L and width w [#permalink]

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New post 23 Nov 2017, 16:10
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Hi All,

We're asked for the perimeter of a rectangle with a length of L and a width of W. You can use a mix of logic and TESTing VALUES to get to the correct answer. Regardless of your approach though, you'll need the formula for perimeter of a rectangle:

Perimeter = 2L + 2W

1) L - W = 15

Fact 1 doesn't provide us with the necessary information to determine the value of 2L + 2W. You can also TEST VALUES to prove the inconsistency:
IF....
L=16, W=1, then the perimeter is 32 + 2 = 34
L=17, W=2, then the perimeter is 34 + 4 = 38
Fact 1 is INSUFFICIENT

2) L + W = 35

Fact 2 gives us the value of L+W. If we double this equation, we'll have...
2L + 2W = 70 and that is the exact value that we're trying to determine. You can also TEST VALUES - and you'll find that the answer is ALWAYS 70.
Fact 2 is SUFFICIENT

Final Answer:
[Reveal] Spoiler:
B


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Kudos [?]: 3668 [1], given: 173

Re: What is the perimeter of a rectangle with length L and width w   [#permalink] 23 Nov 2017, 16:10
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