Question 663956
Just in case you are yet in need of a solution...
{{{(81+89+94+81+x)/5 = 81}}}
Combine like terms
{{{(345 + x)/5 = 81}}}
Multiply both sides by 5
345+x = 405
Group like terms
x = 405 - 345 = 60
x=60 is the next score for an average of 81
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