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Q1:
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.

A I alone sufficient while II alone not sufficient to answer

B Both I and II are not sufficient to answer

C II alone sufficient while I alone not sufficient to answer

D Both I and II are necessary to answer

E Either I or II alone sufficient to answer