In a college, the average weight of 40 boys in a section among 72 students is 33 kg and that of the remaining students is 15 kg. What is the average weight of all the students in the section?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 25 kg.
Total weight of 40 boys = 40 × 33 = 1320 kg
Total weight of 32 students = 32 × 15 = 480 kg
Total weight of all 72 students = 1320 + 480 = 1800 kg
Average weight = Total weight of all students / Total number of students
Average weight = 1800 / 72 = 25 kg