Answer
4. Joan is four years younger than her sister, Cynthia. Joan was sixteen years old when Matt was born. If Matt were sixteen years old, how old would Cynthia be if she were still alive?
There are 4 years between Joan and Cynthia and 16 between Joan and Matt. This makes Cynthia 20 at Matt’s birth. Since Matt is now 16, 16 years must be added. This makes Cynthia 36. 36 years old.