The average weight of 15 people is 70 kg. If one person leaves and the new average becomes 69 kg, what is the weight of the person who left?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 84 kg.
Total weight of 15 people = 15 × 70 = 1050
Total weight of 14 people = 14 × 69 = 966
Weight of the person who left = 1050 - 966 = 84