Discussion :: Average
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The average age of P, Q, R and S is 30 years. How old is R?
I.
The sum of ages of P and R is 60 years.
II.
S is 10 years younger than R.
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A.
I alone sufficient while II alone not sufficient to answer |
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B.
II alone sufficient while I alone not sufficient to answer |
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C.
Either I or II alone sufficient to answer |
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D.
Both I and II are not sufficient to answer |
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E.
Both I and II are necessary to answer |
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Answer : Option D
Explanation :
P + Q + R + S = (30 x 4) 
P + Q + R + S = 120 .... (i)
I. P + R = 60 .... (ii)
II. S = (R - 10) .... (iii)
From (i), (ii) and (iii), we cannot find R.
Correct answer is (D)
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