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26-11-2016
Mathematics

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The value of a car is inversely proportional it its age. If a car is worth $6400 when it is 6 years old, how old will it be when it is worth $4800?

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nobillionaireNobley nobillionaireNobley

28-11-2016

v = k/a
6400 = k/6
k = 6400 x 6 = 38400

4800 = 38400/a
a = 38400/4800 = 8

It will be 8 years old when it is worth $4800.

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