Arianna has punch cards for her favorite tea house and her favorite coffee shop. She currently has 7 punches on the tea punch card and 4 punches on the coffee punch card.
Given her regular routine, she consistently earns 2 new punches per week on the tea punch
card and 5 on the coffee punch card. Before too long, Arianna will have the same number of
punches on each card. How long will that take? How many punches will Arianna have on each
card?