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VamPL
31.08.2019 •
Social Studies
Which best describes the way photographs are considered by historians? a)primary source documents that are useful in the study of history b)reliable sources for the study of history only if from a named source c)secondary source documents that are useful in the study of history d)unreliable sources for the study of history because they are too subjective e)useful sources for the study of personal histories, but not for general history
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Ответ:
Ответ:
D. 22
Step-by-step explanation:
Con la información proporcionada sabes que el administrador puede alimentar 220 vacas durante 45 días y puedes deducir que si el número de vacas aumenta el alimento duraría menos días, lo que significa que estas magnitudes son inversamente proporcionales. Por esto, para encontrar la respuesta debes usar una regla de tres inversa:
220 vacas → 45 días
450 vacas → x
x=(220*45)/450
x= 22 días
De acuerdo a esto, la respuesta es que el administrador podrá alimentar a las 450 vacas por 22 días con la misma cantidad de alimento.