In the barnyard is an assortment of chickens and pigs. counting heads, one finds 13; counting legs, one finds 46. how many pigs and how many chickens are there

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?