Multiple choice

The average weight of certain people in a family is 60 kg. If 5 new guests having weight 10%, 20%, 30% 40% and 50% respectively more than the average weight of the family join the family, then average weight of all people increased by 5 Kg. The number of persons in family joining the guests are: एक परिवार के कुछ लोगों का औसत वजन 60 किलोग्राम है। यदि 5 नए मेहमान जिनका वजन परिवार के औसत वजन से क्रमशः 10%, 20%, 30% 40% और 50% अधिक है, तो सभी लोगों के औसत वजन में 5 किलोग्राम की वृद्धि हुई है। मेहमानों को शामिल करने के बाद परिवार में व्यक्तियों की संख्या है:

  1. 12

  2. 13

  3. 17

  4. 19

  5. None of these इनमे से कोई नही|
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Let n be initial family members. Initial total weight = 60n. 5 guests weigh: 66, 72, 78, 84, 90 (10-50% more than 60). Total guest weight = 390. New average = 65, so (60n + 390)/(n+5) = 65. Solving: 60n + 390 = 65n + 325, giving 5n = 65, so n = 13. New total = n + 5 = 18. Since 18 is not in options and E is 'None of these', option E is correct.

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