Three runners — Andy, Blaise, and Susie — were competing in a 100-meter race. When Andy reached the finish line, Blaise was 10 m
eters behind him. When Blaise reached the finish line, Susie was 10 meters behind her. At the moment that Andy reached the finish line, Susie was how many meters behind him? Keep working and you will earn half credit for correctly solved problem.
Well, Andy had finished the 100 meter race before everyone else. This obviously means that he/she had already ran 100 meters. Blaise was 10 meters behind Andy meaning he was at 90 meters. Then Susie was 10 meters behind Susie, meaning Susie was at 80 meters while Andy was at 100. Finally 100-80=20
