The average age of $A, B$ and $C$ is $25$ years. The Ratio of their ages is $3 : 5 : 7$ . Find the age of $A$ .
$21 y e a r s$
$18 y e a r s$
$15 y e a r s$
Data Inadequate

21 y e a r s

18 y e a r s

15 y e a r s

Data Inadequate

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The average age of $A, B$ and $C$ is $25$ years. The Ratio of their ages is $3 : 5 : 7$ . Find the age of $A$ .
$21 y e a r s$
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$15 y e a r s$
Data Inadequate