Posted by bobby on Wednesday, October 24, 2012 at 7:57pm.
Well first you add up the currently known grades: 84, 65, and 76. (known grades)
Next multiply 80 by 4 to get the total amount for his test scores. (wanted average)
Finally subtract the total for his known grades from his wanted average.
4 * 80 = 320
84 + 65 + 76 = 225
320 - 225 = 95
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