Amisha can complete a task in twenty days. After four days she fell sick for four days and resumed on the ninth day but with half her original work rate. She completed the task in another twelve days with a co-worker who joined from day nine. The num

Question

Amisha can complete a task in twenty days. After four days she fell sick for four days and resumed on the ninth day but with half her original work rate. She completed the task in another twelve days with a co-worker who joined from day nine. The number of days required for the co-worker to complete the task alone would be ______.