Two classes are going to combine to do a project together. the first class has  24  students and the second class has  21  students. if they divide all of the students from the two classes up into  3  groups, how many students will be in each group?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?