The number ratio of black and white leather in football is 3:5. * * * There are 32 skins. How many pieces are there in black and white leather? Column equation

The correct answer at the end of the preface should be: the number of black skin is 12, and the number of white skin is 20. Method 1 If the black skin is X, the white skin is 5/3X; conversely, if the white skin is X, the black skin is 3/5X2. Finally, the equation X+5/3X=32 or X+3/5X=323. ...