The average age of persons A, B, C and D is 30 years. Determine the age of D.
Data statements :
I. The sum of ages of A and C is 60 years.
II. D is 10 years younger than A.
Select the correct option with respect to getting solution to stated problem.
1
Data provided in the statement I alone or statement II alone is sufficient.
2
Data provided in the statement I and II together is sufficient.
3
Data provided in the statement I alone is sufficient and statement II is not necessary.
4
Data provided in the statement I and II is not sufficient.