Question 1166174
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I just solved this problem couple of days ago, and presented the solution with all necessary explanations under this link


<A HREF=https://www.algebra.com/algebra/homework/Average/Average.faq.question.1166093.html>https://www.algebra.com/algebra/homework/Average/Average.faq.question.1166093.html</A>


https://www.algebra.com/algebra/homework/Average/Average.faq.question.1166093.html



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