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Answer:
81
Step-by-step explanation:
Given total number of tests are 5
The grades earned by the students in the tests are 84 , 75 , 97 , 89
let the grade earned by the student in the fifth test be x.
Average=
The condition recquired is Average≥85
≥85
≥85
x≥81.
The least grade the student can earn in the last test so that average is not less than 85 is 81