According to a survey of business firms in a certain city, 750 firms offer their employees health insurance , 640 offer dental insurance and 280 offer health insurance and dental insurance. How many firms offer their employees health insurance or dental

Correct Answer: 1,110
Health insurance = 750 firms Dental insurance = 640 firms Both Health and Dental insurance = 280 firms Either Health insurance or Dental Insurance = (750 + 640 - 280) = 1110 firms