Milk ' n ' Coffee
One morning, each member of Rajat's family drank an 8-ounce mixture of coffee and milk.The amounts of coffee and milk varied from cup to cup, but were never zero. Rajat drank 1/7-th of the total amount of milk and 2/17-th of the total amount of coffee. How many people are there in Rajat's family?
Source : Pre - RMO 2014