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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?

 Feb 3, 2021
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There are 40%*20 = 8 cars.  Let n be the number of card James adds.  Then

(8 + n)/(20) = 0.75

8 + n = 15

n = 7

 

James must add 7 cars.

 Feb 3, 2021

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