(16*9)/4=36

This is like the wrongest answer

If 16 counters are 4/9 then what is the one?

(4/9)/16 = 4/(9*16) = 4/(4*4*9) = 1/(4*9) = 1/36

One counter is 1/36 if 16 of them is 4/9.

One counter is 1/36 if 16 of them is 4/9.