Posted by Mandy on .
In a city with no cars of mixed color, 30% of the cars on the road are brown. Forty percent are either brown or green, and 10% are white.
a.) What is the probability that a randomly selected car is green?
b.) What is the probability that a randomly selected car is not brown, green, or white?
Thanks a bunch for whoever can help!?

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Mariella.,
How many cars were there altogether?

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Mandy,
It doesn't say how many cars in total there were. Im guessing that in total these cars added up to 100%.

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Mariella.,
a.)1/5
b.)1/4 
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Mandy,
Is there anyway that you can show me how you got that so I can understand a little better? Thanks!

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Mariella.,
a.)40% of cars are either brown or green. Divide that by two since there are two colors. You get 20. Put that over 100=20/100. Reduce it to 2/10 which reduces to 1/5.
b.)Add all the percents together to get 80%. Subtract it from 100. 10080=20. 20/100=1/5. So the actual answer to b is 1/5. Sorry, my mistake. :P 
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Mandy,
Thanks a bunch!

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Mariella.,
No problem.(:

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PsyDAG,
What about the undefined remaining 20%?
30% + 40% + 10% = only 80% 
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Jade,
She DID do that.