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by eric.d.giles
Sun Aug 18, 2013 4:34 pm
 
Forum: GMAT Official Practice Test Math
Topic: number of stamps
Replies: 9
Views: 14756
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Re: number of stamps

Why can't you plug x = 30 into 7x/5x rather than the 5x/3x ratio? Since this is the new ratio, shouldn't we get the right answer from it?