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02 May 2019, 03:32
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B
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Difficulty:
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Question Stats:
76% (00:47) correct
24%
(01:11)
wrong
based on 98
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What is the average (arithmetic mean) of 8a and 4b?
(1) a + b = 5
(2) 2a + b = 11
(1) a + b = 5
(2) 2a + b = 11
Archit3110
Major Poster
02 May 2019, 03:37
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Bunuel
average (arithmetic mean) of 8a and 4b
re written as
4a+2b ; 2*(2a+b)
#1
a+b=5
a & b not known insufficeint
#2
2a+b=11
so 2*11; 22
IMO B ; sufficient
02 May 2019, 04:06
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Archit3110
Can't we put the value as "A= 5-B" and solve the equation for the first option?
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