Preheat oven to 350 degrees.
Layer the cut up rhubarb in a greased 9x13 pan.
Sprinkle the cup of sugar over the rhubarb and then sprinkle the strawberry jello on top of the sugar
Pour the dry yellow cake mix over the rhubarb.
Pour the 1 cup water over the cake mix and then lastly pour the melted butter.
Do not stir.
Bake at 350 degrees for 45-55 minutes or until bubbly and lightly browned.