The average age of three girls is $35$ years. The ratio of their age is 3:5:7. Find the age of the youngest one

12

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21

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Solution

The correct option is A $21$
let rational amount be x
Then $3 x + 5 x + 7 x = 35 \times 3$
$\Rightarrow 15 x = 105$
$\Rightarrow x = \frac{105}{15}$
Then youngest girl age $= 3 x$
$= 3 \times 7 = 21 y e a r s$

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