Fish are processed into ?sh meal and used as a supplemen- tary protein food. In the processing the oil is ?rst extracted to produce wet ?sh cake containing 80 wt % water and 20 wt % bone-dry cake. This wet cake feed is dried in rotary-drum dryers to give a "dry" ?sh cake product containing 40 wt % water. Fi- nally, the product is ?nely ground and packed. Calculate the kg/h of wet cake feed needed to produce 1000 kg/h of "dry" ?sh cake product.