ব্যাখ্যা
Question: The average weight of 12 students is 52 kg. If a new student joins, the average becomes 53 kg. What is the weight of the new student?
Solution:
Average weight of 12 students = 52
Total weight = 12 × 52
= 624 kg.
Let the weight of the new student = x kg.
New total number of students = 13
New average = 53
Total weight = 13 × 53
= 689 kg.
Weight of new student = new total - original total
= 689 - 624
= 65 kg
∴ The weight of the new student is 65 kg.