In this question, it is given that y varies inversely as x . So the equation is

And here k is the proportionality constant .
And when x=6, y=12

So the values of the proportionality constant k is 72 and the correct option is B.
I got u.
-4n + 9 = -4n + 9
Kiyo would have 15 quarters.
(See my work)
Hope I helped!! ;)