Question 1114054
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Here is a method you can use for problems like this involving the average (mean) of numbers that are close together....<br>
Her average was 84; her average for the first two games was 81.
That average for her first 2 games is 3 less than her final average.
That means that after the first 2 games she is a total of 2*3=6 points short of her final average.
And that means she has to be 6 points ABOVE her final average in the third game.<br>
So the score in her last game must be 84+6 = 90.