Question : The average weight of some students in a class was 60.5 kg. When 8 students, whose average weight was 65 kg, joined the class, then the average weight of all the students increased by 0.9 kg. The number of students in the class, initially, was:
Option 1: 37
Option 2: 42
Option 3: 32
Option 4: 40
Answer (1)
13th Jan, 2024
Correct Answer: 32
Solution :
Let the total number of students be
Average weight of
The sum of the weights of
The average weight of 8 students = 65 kg
The sum of the weights of 8 students = 65 × 8 = 520 kg
According to the question,
Hence, the correct answer is 32.
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