Average weight of 20 persons is 60 kg. A new person joins the group and average weight of 21 persons becomes 59 kg. What will be the weight of new person?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 39 kg.
Total weight of the initial 20 persons = 20 × 60 = 1200 kg
Total weight of the 21 persons = 21 × 59 = 1239 kg
Weight of new person = 1239 - 1200 = 39 kg