Q. Brian is taking 3 courses this semester: economics, statistics also finance. He has decided to spend 19 hours per week studying (in addition to attending all his classes) also his objective is to maximize his average grade, elucidate which means maximizing the total of his grades in the 3 courses. The table shows Brian's estimate of the relation among time spends studying also his grade for each course. Notice it is assumed that Brian will spend at least 4 hours per week studying each of the 3 courses.