1.

The average weight of 12 students and 9 teachers is 42 kg. If the average weight of 9 teachers is 66 kg, find the average weight of 12 students.​

Answer»

24Step-by-step EXPLANATION:the AVERAGE weight of teachers = 66kgso average = sum of WEIGHTS of all teachers / no. of teachers 66= x/9=x= 9*66x=594so that means the weight of teachers = 594now average of teachers and students combined = 42(y+594)/(9+12)=42y+594=42*21y+594=882y=882-594y=288the sum of weights of students = 288and the average = 288/12=24



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