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14 Mar 2017, 08:55
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
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Question Stats:
100% (00:26) correct
0%
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wrong
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Find the length of the rectangle?
(1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
(1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
14 Mar 2017, 12:21
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vikasp99
Find the length of the rectangle?
(1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
Dear vikasp99, (1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
I'm happy to respond.
This question is is far too easy to be on the GMAT. This is a essentially a low-level practice questions, for people reviewing the basics before they are ready for GMAT math.
Perimeter of a rectangle = 2*L + 2*W
If we know both the perimeter and the width, we can calculate the length very easily.
OA = (C)
Here are some more GMAT-like DS practice questions on geometry:
GMAT Data Sufficiency Geometry Practice Questions
Does all this make sense?
Mike
14 Mar 2017, 16:22
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vikasp99
Find the length of the rectangle?
(1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
(1) The perimeter of the rectangle is 120
(2) The width of the rectangle is 20
This question is about a length \(l\) and a width \(w\) from the below conditions.
There are two variables and no equation.
Hence C is most likely the correct answer.
The question is what is the value of \(l\).
Condition 1) : \(2(l+w) = 120\).
Condition 2) : \(w = 20\)
For the condition 1), it is clearly not sufficient, since we don't know anything about \(w\). Hence, we can not get a value of \(l\).
For the condition 2), the given equation does not any clue for the variable \(l\).
For both the conditions 1) and 2) together, \(w = 20\) and so \(2(l+w) = 2(l+20) = 2l + 40 = 120 or 2l = 80\).
Hence, \(l = 40\).
Therefore, both conditions together, they are sufficient.
The correct answer is C
