Question

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 1

Answer:

24

Step-by-step explanation:

the average weight of teachers = 66kg

so average = sum of weights of all teachers / no. of teachers

66= x/9=

x= 9*66

x=594

so that means the weight of teachers = 594

now average of teachers and students combined = 42

(y+594)/(9+12)=42

y+594=42*21

y+594=882

y=882-594

y=288

the sum of weights of students = 288

and the average = 288/12=24