Question

NS 27. The average age of 28 students is 9 yr. If the
age of their teacher is included, it becomes 10
02
yr. The age of the teacher (in years) is :
(a) 27
(b) 31
(c) 38
(d) 40​

Answer 1

Answer:

c) 38

Step-by-step explanation:

total age of students = 9x28=252

let the age of the teacher be x

including teacher, the number of people becomes 29

(252+x)/29=10

252+x=290

x=290-252

x=38