Hi,         

weight W of an object is directly proportional to its weight B on earth

Let x represent the weight on Mars for man weighing 98kg on earth

question Sets Up the Proportion



Solving for x

 98*47.5 = 118.75x

  98*47.5/118.75 = x

             x = 39.2kg, the weight on Mars for man weighing 98kg on earth

CHECKING our Answer

118.75kg/47.5kg = 2.5 = 98/39.2 

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