Solving a simpler analogues problem.

Problem.

Given the four numbers

7,895

13,127

51,873

7,356

What percent of their sum is their average?

Solution:

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%.

Tentang matitaputtychristi

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Pos ini dipublikasikan di Problem Solving, Strategy. Tandai permalink.

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