Jaya's attendance for first two semesters out of four was 60% and 70%, respectively. What is the minimum attendance required in third semester so that her average attendance will be 80% throughout four semesters? (Assume equal number of days among the four semesters)

To find the minimum attendance required in the third semester, we must first maximize the attendance in the fourth semester by making it 100%. The total attendance needed across all four semesters to achieve an 80% average is 4 times 80, which equals 320 percentage points. The sum of her first, second, and fourth semesters is 60 plus 70 plus 100, totaling 230, so the required attendance for the third semester is 320 minus 230, which is 90%.

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