Question

the average of 20 students is 12 years of the teacher whose wieght is 33 years then what will be the average age of all ?​

Answer 1

Answer:

the average age of 20 students = 12 years

so the sum of ages of 20 students =20*12 = 240 years

the age of teacher = 33 years

the average age of all = (age of teacher +age of all students) / number of students + teacher

so the average age of all = (33 + 240) / (20 + 1)

= 273/21 = 13 years

Step-by-step explanation: