Given the four numbers
What percent of their sum is their average?
The typical student does exactly what the problem calls for. That is, first find the sum of the four numbers; then find their avarage. Finally, devide and convert to a percent.
We can solve a simpler analogues problem by consedering the general case. Let the sum of these numbers be represented by S. Then their average is S/4. Now, to find what percent the average is of the sum, we first devide
Now, we change ¼ to a precent and get 25%.