The percentage that Brain will get is 55.3%.
From the information given, Brian has earned 65%, 80% and 92% on his three pre-final exams.
The lowest counts for only 20% of his overall grade, while the other two count for 25% each.
There, the highest percentage that he will get will be:
= [(20% × 237) + (25% × 237) + (25% × 237) ]/3
= (47.4 + 59.25 + 59.25)/4
= 165.9/3
= 55.3%
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