Question 1168055
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Let x be the weight of a small box (in pounds).  The the weight of the large box is (80-x) lbs.


The total weight equation is

   65(80-x) + 70x = 5325


From the equation,


    x = {{{(5325-65*80)/(70-65)}}} = 25.


<U>ANSWER</U>.  The weight of the small box is 25 lbs; of the large box 80-25 = 55 lbs.
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Solved.