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If x and r are directly proportional and x=5 when r= 25, then what is x when r = 40?

 Jun 16, 2021
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Directly proprtional means     x = k r     where 'k' is the proprtionality constant.

                   when x = 5           5 = k(25)    shows 'k' to = 1/5

 

 

when r = 40

    x = 1/5 (40) = 8    

 Jun 16, 2021

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