Question 1004876
We'll call the final grade x. Since it equals two grades: 2x
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(80+72+86+2x)/5= 84
(238+2x)/5= 84 Multiply both sides times 5 (the magical rule of "do no harm" in equations, always do to one side what you do to the other):
238+2x= 420 Subtract 238 from both sides:
2x= 182
x= 91