Question

the average age of whole class with teacher is 15 years.the avg age of whole class without teacher is 12 years. ifbthe teacher age is 45 years old .the how many students have in this class​

Answer 1

Answer:

10

Step-by-step explanation:

Let total age of student be x and teacher be y.

Let total number of students be z.

So y=45......1

x+y/z+1=15.....2

x/z=12.....3

So,

By 1,2,3..

12z+45/z+1=15

12z+45=15z+15

-3z=-30

z=10

Hence, 10 students are there in class

Answer 2

Answer:

ghar mein kisi bade se puch lo