**If**

*y*=*kx*, where*k*is a constant such that*x*= 5 when*y*= 1/3, what is the value of*x*when*y*= 12?**A. 36/5**

B. 15/12

C. 180

D. 12/15

First find the value of

*k*: Using the known

*y*and

*x*-values, we have 1/3 = 5

*k*, making

*k*= 1/15. When

*y*= 12, we have 12 = (1/15)

*x*, making

*x*= 180. The correct choice is (C).

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