Question

only no.4 please answer it

Answer 1

let fifth person height is x
Average=(sum of members/total members)
150=(153+150+151+152+x)/5
150=(606+x)/5
150*5=606+x
750=606+x
750-606=x
144=x

Answer 2

Let the height of fifth person be x

And I hope this will help you
Sorry something is wrong in the pic

750-606=144=x
Then ur answer =144 is the height of fifth person