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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?

 May 24, 2020
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20 in the collection     .4 (20 ) = cars = 8 cars

 

add x number of cars to the collection to make it 75% cars

 

(20 + x)(.75) = 8+x

15 + .75x = 8 + x        you can take it from here !  cheeky

 May 24, 2020

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