SOLUTION: how do you slove this problem? I keep getting 500 when the answer in my book says the answer is 20. help?

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Question 534955: how do you slove this problem? I keep getting 500 when the answer in my book says the answer is 20. help?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
where is the problem?