In the figure above, the angle marked at c has been created by extending the base of the triangle, as shown. What is the sum of a, b, and c?
(1) a = 85
(2) b = 60
OA A
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In the figure above, the angle marked at c has been created
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BTGmoderatorDC
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In the figure above, the angle marked at c has been created by extending the base of the triangle, as shown. What is the sum of a, b, and c?
(1) a = 85
(2) b = 60
OA A
Source: Veritas Prep
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GMATGuruNY
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Since b and c form a straight line, b+c = 180.BTGmoderatorDC wrote:
In the figure above, the angle marked at c has been created by extending the base of the triangle, as shown. What is the sum of a, b, and c?
(1) a = 85
(2) b = 60
Thus, the calculate a+b+c, we need to know the value of a.
Question stem, rephrased:
What is the value of a?
Statement 1:
SUFFICIENT.
Statement 2:
No information about a.
INSUFFICIENT.
The correct answer is A.
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Brent@GMATPrepNow
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Target question: What is the sum of a, b, and c?BTGmoderatorDC wrote:
In the figure above, the angle marked at c has been created by extending the base of the triangle, as shown. What is the sum of a, b, and c?
(1) a = 85
(2) b = 60
This is a good candidate for rephrasing the target question.
Since angles on a line add to 180°, we already know that b + c = 180
We get: a + b + c = a + 180
So, in order to find the sum of a, b and c, we need only find the value of a
REPHRASED target question: What is the value of a?
Aside: Here's a video with tips on rephrasing the target question: https://www.gmatprepnow.com/module/gmat- ... cy?id=1100
Statement 1: a = 85
Perfect! The answer to the REPHRASED target question is a = 85
Since we can answer the REPHRASED target question with certainty, statement 1 is SUFFICIENT
Statement 2: b = 60
We have no information about a
Since we cannot answer the REPHRASED target question with certainty, statement 2 is NOT SUFFICIENT
Answer: A
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