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:
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Answer: 32 students initially
Average weight of class = 60.5 kg
Average weight of 8 new students = 65 kg
So, Amount of weight added to the average = 4.5 x 8 = 36kg
Average weight of class increased by 0.9 kg
No. of students in class = 36/0.9 = 40
No. of students in class initially = 40 - 8 = 32
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