The average age of three persons is 30 years. If the ratio of three ages is 3 : 5 : 7, what is the age of the youngest person ?
A. 18 years
B. 8 years
C. 16 years
D. 42 years
E. None of these
সঠিক উত্তরঃ
A.
18 years
Explanation:
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