Tina, Dora, Wilson, and Kane together placed a total of 25 cakes on a tray. Tina placed 0.24 of the cakes, Dora placed 9 of the 25 cakes, Wilson placed 20% of the cakes, and Kane placed the remaining cakes. Who placed the most cakes?

The number of cakes Tina placed is 0.24 x 25 = <<0.24*25=6>>6 cakes.

Dora placed 9 cakes.
Wilson placed 20% x 25 = <<20*.01*25=5>>5 cakes.
Kane placed 25 - 6 - 9 - 5 = <<25-6-9-5=5>>5 cakes.
Therefore, Tina placed the most cakes. Answer: \boxed{Tina}.