Jenny's average on 4 exams is 80. Assuming she cannot earn more than 100 on any exam. What is the least she can earn on her 5th exam and still have a chance for an average of 84 after seven exams?

Correct Answer: 68
Total number of jenny after 4 exam = 80× 4 = 320 Total not of jenny after 7 exam = 84×7 = 588 Total no of jenny 5th, 6th, and 7th, exam = 588 - 320 = 268 She can earn highest 200 marks on 6th and 7th exam. She must earned at least ( 268 - 200) = 68 marks on 5th exam.