IBPS RRB Officer Scale-I Prelims practice question

7 years ago, the average age of a group of six colleagues of 6 members was 30 years. No member has left or joined the group of six colleagues since then. What is the average age of the group of six colleagues now?

From a IBPS RRB Officer Scale-I Prelims Quantitative Aptitude practice set · Quantitative Aptitude

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Correct answer: (B) 37 years

Since no member left or joined, each of the 6 members has simply grown older by 7 years, so the average age also increases by 7 years. Present average age = 30 + 7 = 37 years.

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7 वर्ष पहले एक छह सहकर्मियों के समूह के 6 सदस्यों की औसत आयु 30 वर्ष थी। तब से न तो कोई सदस्य गया है और न ही कोई नया जुड़ा है। अब छह सहकर्मियों के समूह की औसत आयु कितनी है?

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सही उत्तर: (B) 37 वर्ष

चूँकि कोई सदस्य न तो गया है और न ही नया जुड़ा है, इसलिए सभी 6 सदस्य 7 वर्ष बड़े हो गए हैं, जिससे औसत आयु भी 7 वर्ष बढ़ जाएगी। वर्तमान औसत आयु = 30 + 7 = 37 वर्ष।

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7 years ago, the average age of a group of six colleagues of 6 members was 30 years. No member has left or joined the group of six colleagues since then. What is the average age of the group of six colleagues now?

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