Tanu 39 s attendance for the first two semesters out of four was 60 and 70 respectively What is the ...........

Quantitative Aptitude (CDS) Percentage

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

89%

96%

90%

65%

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Explanation:

Let, there are 100 days in each semester then,
Tanu total attendance for four semesters = 4*(80% of 100)
= 4*80 = 320 days
To know the minimum attendance in the 3rd semester, we must assume 100% attendance in the 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%