Question 1194266
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The solution shown by the other tutor is a standard solution method.<br>
Here is a different method you can try to see if you like it....<br>
The difference between the two averages is 6; that means in the first 10 games her total score was 10*6 = 60 short of the new average.<br>
That means the 11th score has to be 60 points above the new average.<br>
ANSWER: Her score in the 11th game was 310+60 = 370.<br>