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)
Let, there are 100 days in each semester then,
Jaya’s total attendance for four semesters = 4*(80% of 100)
= 4*80 = 320 days
To know the minimum attendance in 3rd semester, we must assume 100% attendance in 4th semester.
Thus, minimum attendance required in 3rd semester
= 320 – (60 + 70 + 100) days = 90 days
= i.e. 90%
So, the minimum attendance required in third semester = 90%
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