Task: Question Answering
Input (English): Problem: each of the products produced yesterday was checked by worker x or worker y. 0.5 % of the products checked by worker x are defective and 0.8 % of the products checked by worker y are defective. if the total defective rate of all the products checked by worker x and worker y is 0.65 %, what fraction of the products was checked by worker y ?
Options: a. 1 / 5, b. 1 / 2, c. 2 / 3, d. 1 / 4, e. 2 / 5
Output (English): b