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26 Jan 2016, 08:18
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Difficulty:
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Question Stats:
82% (00:41) correct
18%
(00:47)
wrong
based on 184
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What is the sum of five numbers?
(1) The average of the numbers is zero
(2) Only one of the numbers is positive.
(1) The average of the numbers is zero
(2) Only one of the numbers is positive.
26 Jan 2016, 08:48
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Let the five numbers be n1 , n2 , n3 , n4 and n5
(1) The average of the numbers is zero
Average of 5 numbers = Sum/5 = (n1+n2+n3+n4+n5)/5
=>Sum = Average *5 = 0
=> n1+n2+n3+n4+n5 = 0
Sufficient
(2) Only one of the numbers is positive.
Not sufficient
Answer A
(1) The average of the numbers is zero
Average of 5 numbers = Sum/5 = (n1+n2+n3+n4+n5)/5
=>Sum = Average *5 = 0
=> n1+n2+n3+n4+n5 = 0
Sufficient
(2) Only one of the numbers is positive.
Not sufficient
Answer A
