Question : The average weight of six persons is 30 kg. If a new person joins this group, then the average weight becomes 28 kg. What is the weight of the new person?
Option 1: 22 kg
Option 2: 14 kg
Option 3: 15 kg
Option 4: 16 kg
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Correct Answer: 16 kg
Solution : The average weight of 6 persons = 30 kg So, the sum of the weights of 6 persons = 30 × 6 = 180 kg When a new person joins this group, then the average weight = 28 kg The sum of the weights of seven persons = 28 × 7 = 196 kg So, the weight of the new person = 196 – 180 = 16 kg Hence, the correct answer is 16 kg.
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