2014-09-05 09:00:39

Whippoorwill's Well-Knit Wool Store tracked customer transactions for a full week. In that week, 550 customers entered the store, and 450 made a purchase. 325 customers purchased sweaters, and 200 customers purchased scarves. How many customers purchased both a sweaters and scarves?

The correct answer is 75
Explanation: Add up the number of customers who purchased either sweaters or scarves and subtract from it the number of customers who purchased anything. That will represent the overlap.

525 customers purchased either sweaters, scarves, or both. 450 customers made a purchase. Thus, the overlap is 525 - 450, or 75. This means that 75 people purchased both sweaters or scarves.