Question
The Average weight of 12 students in the class is 38
kg, when 4 new students included, the average weight becomes 39.5 kg and the weight of those 4 students was 46, 52, 36 and 42 kg. Find the total number of students in the class?Solution
Average weight of new students = (46+52+36+42)/4 = 44 
3 units = 12 students Total = 12 + 4 = 16 students
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