Question

If x is inversely proportional to y, and x = 60 when y = 0.5, find x when y = 12. A. 0.4 B. 25 C. 360 D. 2.5

Answer 1

"x is inversely proportional to y" means x = k/y

Plug in x = 60 and y = 0.5 then solve for k
x = k/y
60 = k/0.5
60*0.5 = k
k = 30

Now plug in y = 12 to find x
x = k/y
x = 30/y
x = 30/12
x = 2.5
Answer is choice D