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31 Jul 2014, 14:50
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
68% (01:46) correct
32%
(01:04)
wrong
based on 558
sessions
History
Date
Time
Result
Not Attempted Yet
What is the average of a, b and c?
(1) The average of a and b is c.
(2) The average of b and c is 4.
(1) The average of a and b is c.
(2) The average of b and c is 4.
01 Aug 2014, 07:30
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What is the average of a, b and c?
The average of a, b and c is (a + b + c)/3. So, basically to answer the question we need to know the value of a + b + c.
(1) The average of a and b is c --> (a + b)/2 = c --> a + b = 2c. Not sufficient.
(2) The average of b and c is 4 --> (b + c)/2 = 4 --> c = 8 - b. Not sufficient.
(1)+(2) We have that a + b = 2c and c = 8 - b, thus a + b + c = 2c + c = 3c = 3(8 - b). Without knowing the value of c or b we cannot get this value. For example, consider a = 1, b = 5, c = 3 or a = 4, b = 4 and c = 4. Not sufficient.
Answer: E.
The average of a, b and c is (a + b + c)/3. So, basically to answer the question we need to know the value of a + b + c.
(1) The average of a and b is c --> (a + b)/2 = c --> a + b = 2c. Not sufficient.
(2) The average of b and c is 4 --> (b + c)/2 = 4 --> c = 8 - b. Not sufficient.
(1)+(2) We have that a + b = 2c and c = 8 - b, thus a + b + c = 2c + c = 3c = 3(8 - b). Without knowing the value of c or b we cannot get this value. For example, consider a = 1, b = 5, c = 3 or a = 4, b = 4 and c = 4. Not sufficient.
Answer: E.
urfrndniks
Joined: 08 Jun 2013
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Schools: Olin '19 (A) Fisher '19 (D) UC Davis '19 (A) Arizona State"19 (D) Merage '19 (A$) Carlson '19 (D) Mays '19 (D) Mendoza '19 (WL) McDonough '19 (WL) Anderson '19 (D)
18 Sep 2016, 04:47
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A) avg of a and b is c
hence, a+b = 2c
further avg of a,b,c = (a+b+c)/3 = 3c/3 => c but value of c is unknown, Not suff
B) avg of b and c is 4 , so, b+c = 8 , but value of a is unknown
combining we can't deduce value of c, not sufficient again
E is the answer
hence, a+b = 2c
further avg of a,b,c = (a+b+c)/3 = 3c/3 => c but value of c is unknown, Not suff
B) avg of b and c is 4 , so, b+c = 8 , but value of a is unknown
combining we can't deduce value of c, not sufficient again
E is the answer
