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9 years ago, the average age of a family...

9 years ago, the average age of a family of five members was 33 years. Now, three new members join whose ages are in ascending order with consecutive gaps of 8 years. If the present average age of the family is the same as it was 9 years ago, what is the age (in years) of the youngest new member?
9 वर्ष पहले, पांच सदस्यों के एक परिवार की औसत उम्र 33 वर्ष थी | अब, तीन नए सदस्य शामिल हो गए हैं जिनकी उम्र आरोही क्रम में है एवं इनकी उम्रों में आठ वर्ष का अनुगामी अंतराल है | यदि परिवार की वर्तमान औसत उम्र उतनी ही है जितनी यह 9 वर्ष पहले थी, तो नए छोटे सदस्य की उम्र ( वर्ष में ) ज्ञात करें |

A

15

B

17

C

10

D

9

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