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Here's another way.....since the final exam counts twice as much as the others, we have

[63 + 75 + 72 + (2)80]  / 5   = 74

74  is the answer

Bob gets tests grades of 63, 75, and 72. He gets an 80 on his final exam. Find the weighted average if each tests counts for 20%, and the final exam counts for 40% of the final grade

[(63 + 75 + 72) X 20%] + [80 X 40%] =74- Bob's weighted average grade.