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The following is based on the correct order of operations. If the way you phrased the question is not what you actually meant, please go back and edit the question and I'll be happy to answer the new version.

(40/x)(100)(.25)+(60/x)(100)(.75)=50

(1,000/x)+(4,500/x)=50

5,500/x=50

50x=5,500

x=110

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12y ago

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