Can anyone help? I have no idea how to get full marks for it

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

A50% increase followed by 33 1/2% decrease

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?