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11 Jul 2020, 22:54
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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:
15%
(low)
Question Stats:
83% (00:47) correct
17%
(01:14)
wrong
based on 46
sessions
History
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The arithmetic mean (average) of two numbers is \(P * Q\). If the first number is Q, what is the other number?
(A) \(2PQ - Q\)
(B) \(PQ - 2Q\)
(C) \(2PQ - P\)
(D) \(P\)
(E) \(PQ - Q\)
(A) \(2PQ - Q\)
(B) \(PQ - 2Q\)
(C) \(2PQ - P\)
(D) \(P\)
(E) \(PQ - Q\)
11 Jul 2020, 22:58
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SajjadAhmad
Let, Other number is A
\(\frac{A+Q}{2} = PQ\)
i.e. \(2PQ = A+Q\)
i.e. \(2PQ - Q = A\)
Answer: Option A
11 Jul 2020, 23:52
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Let the second number be X.
Now Sum = \(Average \times #(observations)\)
\(X + Q = 2(PQ)\)
\(X = 2PQ - Q\)
OA, A
Now Sum = \(Average \times #(observations)\)
\(X + Q = 2(PQ)\)
\(X = 2PQ - Q\)
OA, A
SajjadAhmad
