Raj's monthly salary is Rs. 4000. What is Arun's monthly salary?
I. Arun gets Rs. 500 more than the average salary of his and Raj's.
II. Average of Raj's and Arun's salary is Rs.4500.
From I we have: A-4000=1000 or A=5000. i.e. Arun's monthly salary is 5000.
From II we have A+R/2=4500 or A+4000 = 9000 or A = 5000.
Thus either I or II is sufficient.
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