Question 1043060
1/5 means what? It means 1 out of 5, or one divided into 5. If I  have a round pizza or a round cake and cut it into 5 equal slices, every slice will be 1/5.
1 whole pizza is 100%. If you want to know 1/5 of 100% you have to divide 100 into 5... 20 comes to mind, no?