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04 Apr 2018, 23:24
Kudos
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
62% (01:08) correct
38%
(01:14)
wrong
based on 115
sessions
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Not Attempted Yet
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
Attachment:
Triangle_with_extended_side.png [ 6.45 KiB | Viewed 3566 times ]
04 Apr 2018, 23:36
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Bunuel
from fig b+c=180
from1:a=85
sum of a, b, and c=85+180
sufficient
from 2:insufficient
21 Feb 2019, 07:56
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Bunuel
Target question: What is the sum of a, b, and c?
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: The video below has tips on rephrasing the target question
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
Cheers,
Brent
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