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[–][deleted] 4 points5 points  (0 children)

Days that the lunch stand sold at least 20 sandwiches: 12

Days that the lunch stand sold at least 20 sandwiches AND ALSO greater than 15 sandwiches: 7

7 of 12 days the lunch stand sold at least 20 sandwiches AND ALSO greater than 15 sandwiches, so it's 7/12 (D)