Question

average height of 10 students=4' 2"
average height of class with teacher = 4' 4"
height of teacher = ?

Answer 1

avg height of stu's = 4'2"
therefore height of 10 stu's = 41'8"
avg with teacher = 4'4"
so height of stu's with teacher=47'8"
the height of teacher = 47'8"-41'8"
                                  = 6'

Answer 2

Answer:

avg height of stu's =4'2"

therefore height of 10 stu's =41'8"

avg with teacher=4'4"

so height of stu's with teacher =47'8"

the height of teacher =47'8"-4'8"= 6'