Task: Question Answering
Input (English): Problem: of the 200 stamps in a collection, 90 are foreign and 80 are more than 10 years old. if 20 stamps are both foreign and more than 10 years old, how many stamps are neither foreign nor more than 10 years old ?
Options: a. 50, b. 80, c. 100, d. 130, e. 150
Output (English): a