The average age of a man and his son is 20. After 10 years, their age will be in the ratio 2:1. What was the age of the man and his son 5 years ago respectively?
A. 15,5
B. 25,15
C. 25,5
D. 15,10
E. none
সঠিক উত্তরঃ
C.
25,5
Explanation:
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