The average weight of 54 members of a club is 67.5 kg. If 6 members of average weight 72.5 kg leave and 2 new members of average weight 62.5 kg join the club, then the average weight (in kg) of the present members of the club is:
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Correct answer: D
Explanation
The correct answer is Option 4 i.e. 66.7.
Total weight of 54 members = 54 × 67.5 = 3645 kg
Total weight of the 6 members left = 6 × 72.5 = 435 kg
Total weight of the 2 new members = 2 × 62.5 = 125 kg
Total weight of the present members of the club = 3645 - 435 + 125 = 3335 kg
Number of present members = 54 - 6 + 2 = 50
Now, the average weight = 3335/50 = 66.7 kg