Question 872516
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Hi
{{{(10*2.5 + 12*3 + 4n)/(n +22) = 3.1}}}
{{{(25 + 36 + 4n )/(n +22) = 3.1}}}
     61 + 4n = 3.1n + 68.2
         .9n = 7.2
           n = 8