Abox contains a collection of triangular and square tiles. there are 25 tiles in the box, containing 84 edges total. how many square tiles are there in the box?

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?