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26 Jul 2018, 00:22
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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:
45%
(medium)
Question Stats:
65% (01:48) correct
35%
(01:52)
wrong
based on 240
sessions
History
Date
Time
Result
Not Attempted Yet
Each of a, b, and c is a positive integer, 3b < a, and a + b = c. What is the value of b?
(1) c = 8
(2) a = 7
(1) c = 8
(2) a = 7
26 Jul 2018, 01:24
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Each of a, b, and c is a positive integer, 3b < a, and a + b = c. What is the value of b?
(1) c = 8
so \(a+b=8\).......
now a>3b....least value of b is 1
so a>3b or a>3......so \((>3)+1=8........(>3)=7\)....YES
but if b is 2,
a>3*2 or a>6, so \((>6)+2=8..........(>6)=6\).....NO
so ONLY possibility of b is 1
sufficient
(2) a = 7
can be any value of b and c
insuff
A
(1) c = 8
so \(a+b=8\).......
now a>3b....least value of b is 1
so a>3b or a>3......so \((>3)+1=8........(>3)=7\)....YES
but if b is 2,
a>3*2 or a>6, so \((>6)+2=8..........(>6)=6\).....NO
so ONLY possibility of b is 1
sufficient
(2) a = 7
can be any value of b and c
insuff
A
26 Jul 2018, 12:59
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From 1, we get the only possible value of b=1, since 3b<a. Sufficient.
From 2, we get b=1 or b=2, since a=7. Not Sufficient.
Hence, A.
From 2, we get b=1 or b=2, since a=7. Not Sufficient.
Hence, A.
