word problem using percents

dsj1023

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Joined
Oct 5, 2008
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I hope this is the right section to post this problem under. Here is the word problem and what I have figured out so far.

One container of feed is 25% nitrogen. Another container is 5% nitrogen. How many gallons of each are mixed together to get 20 gallons that is 8% nitrogen?

I let x represent the first container and y represent the second container. But then from there ??? Does x+y = 20 or Does x+y = 8% How do I keep going?

Thanks for any help!
 
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