Question 1145657
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When a problem is about averages of numbers that are close together, I find the following method of solving by far the easiest.<br>
Your first test is 1 above the average you want; the second is 3 below.
With those two together, you are 2 points below the average you want.
So your third test needs to be 2 points above the average you want.<br>
ANSWER: 75+2 = 77