The statement suppose that y varies directly with x is best represented as:
y α x
To make it into equality, we insert a proportionality constant, k:
y= kx
Using the initial conditions, we solve for k.
y= kx
y = 25 when x = 140
25 = k(140)
k = 5/28
Thus, when y = 36,
36 =5/28x
x = 201.6 -----> OPTION C