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James has a collection of 20 miniature cars and trucks. Cars make up 40% of the collection. If James adds only cars to his collection, how many cars must he add to make the collection 75% cars?

 Aug 11, 2019
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20(.4) + x    =  (20+x)(.75)

 

Solve for x = 28  cars must be added.

 Aug 11, 2019

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