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The average age of a family of six members is 30 years. The youngest members of the family are twins with age 10 years. Find the average age of the family just before the birth of the twins.

1. 28 years
2. 25 years
3. 30 years
4. 32 years

किसी परिवार के छह सदस्यों की औसत आयु 30 वर्ष है। इस परिवार के सबसे छोटे 10 वर्षीय सदस्य जुड़वाँ हैं तो जुड़वा सदस्यों के जन्म से ठीक पूर्व परिवार के सदस्यों की औसत आयु ज्ञात करें-

1. 28 वर्ष
2. 25 वर्ष
3. 30 वर्ष
4. 32 वर्ष
This Question came in
UGC-NET-Geography-03-March-2023-Shift-2-Q22
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Detailed Explanation & Answer
Total age of the family = 6*30 = 180 years
total age of the family without twins at the age of 10 = 180 - 20 = 160
Now, before 10 years when twins are not born,
the total age of the the 4 member family = 160 -(4*10) = 160 - 40 = 120

Now, the average of 4 member family = 120/4 = 30 years
परिवार की कुल आयु = 6*30 = 180 वर्ष
10 वर्ष की आयु में जुड़वां बच्चों के बिना परिवार की कुल आयु = 180 - 20 = 160
अब 10 साल से पहले जब जुड़वाँ बच्चे पैदा नहीं होंगे.
4 सदस्यों वाले परिवार की कुल आयु = 160 -(4*10) = 160 - 40 = 120

अब, 4 सदस्यीय परिवार का औसत = 120/4 = 30 वर्ष
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