Question 836126
The average is the sum of the numbers divided by the count of numbers.
Let {{{A}}},{{{B}}},{{{C}}},{{{D}}},{{{E}}}, and {{{F}}} be the numbers.
{{{(A+B+C+D+E+F)/6=65}}}
{{{A+B+C+D+E+F=390}}}
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{{{(A+B+C+D+E)/5=72}}}
{{{A+B+C+D+E=360}}}
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{{{(A+B+C+D+E)+F=390}}}
{{{360+F=390}}}
{{{F=30}}}