Mathematics, 06.04.2021 22:40 coolaadhya123

Se compran libros a razón de 3 libros por 35 soles, y se venden libros a razón de 21 libros por 200 soles ¿Cuántos libros se vendieron, si la ganancia fue 685 soles?

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Se compran libros a razón de 3 libros por 35 soles, y se venden libros a razón de 21 libros por 200...

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