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Question

Q. The average age of a senior citizens group of 12 members is 72. If a new member is added, then the average age increases by 1year. Find the age of the new member.

Q. 12 सदस्यों के एक वरिष्ठ नागरिक समूह की औसत आयु 72 वर्ष है। यदि इसमें एक नया सदस्य जुड़ता है, तो औसत आयु 1 वर्ष बढ़ जाती है। नए सदस्य की आयु ज्ञात कीजिए।


A
75
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B
82
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C
80
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D
85
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Solution

The correct option is D 85

The sum total age of 12 senior citizens =12×72=864

A new member comes in and average becomes 73

So total age after new member joins =13×73=949

Age of new member + total age of 12=949

Therefore the age of the new member =949864=85


12 वरिष्ठ नागरिकों की कुल आयु =12×72=864

एक नए सदस्य के आने के बाद औसत 73 हो जाता है

इसलिए, नए सदस्य के आने के बाद कुल आयु =13×73=949

नए सदस्य की आयु +12 नागरिकों की कुल आयु =949

इसलिए, नए सदस्य की आयु =949864=85


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