Question

Around 20% of children show signs of obesity.Establish a linear equation between total children and total children who are obeise.From the same find the no: of children who are obeise if total children are 500???(It's an otba question please try to help)

Answer 1

Let the total no. of student = x
and total no. of  obeise student = y 

a/q,
y = 20 % of  x.
⇒y = 20x/100
⇒y = x/5
⇒5y = x
⇒x - 5y = 0 ---------Eqn(i)
This is the linear equation.
Now, 
given that total no of student = x = 500
Therefore no. of obeise students = y = x/5 = 500/5 = 100.