Aptitude - Averages - Discussion

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Q.

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. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer

Answer: Option D
Explaination:

 


Discussion

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