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[at-l] Math Help Needed

Hi -

I have a question that I hope ya'll can answer for me. It probably involves 
simple math, but I'm feeling quite clueless today....

I need to blow up a map from a scale of 1 inch = 2.9 miles (5/16th inch = 1 
mile or 1:182,000) to a scale of 1 inch = 2.3 miles (7/16th inch = 1 mile or 
1:150,000). The question is: what setting should I use on a photocopy 

Hope that all made sense to someone. I look forward to hearing from you. 

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