Systems of Linear Equations
Bobby didn't have any cookies, so he started buying two cookies per day. He didn't eat them, only collected them in a box. He used to collect stamps. We don't know why he decided to make the switch to something perishable.
Jen started out with 100 cookies and ate 3 every day. Apparently, she is a collector of calories. Delicious, delicious calories.
After how many days did Bobby and Jen have the same number of cookies?