Question

y and x have a proportional relationship, and y = 25 when x = 60.
What is the value of x when y = 30?

-25
-36
-50
-72

Answer 1

Answer:

This equation can be solved by using y = kx.  

Since y = 25 when x = 60,

25 = 60k and if we solve for k then k= 5/12.

That means the equation we're using is

y = (5/12)x.

Plug in y = 30 and you get

30 = (5/12)x

Solve for x

30 * (12/5) = x

360/5 = x

x = 72

Answer 2

72 is the answer to this problem