I still don't know why I need to list the equations in the first volume of the sixth grade math application problem. I can give examples and explain them in detail.

..... First of all, can you make a relational expression? For example, a very simple question: oranges weigh 80 kilograms, which is four-fifths of that of apples.

Then the relationship is: apples × four fifths equals oranges.

Let the apple be x, that is, X× four fifths =80.

Answer: four fifths X=80.

X=80× 5/4

X= 100

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