To receive grade A in a course one must obtain an average of 90 marks or more in five papers, each of 100 marks. If Tanvy scored 89, 93, 95 and 91 marks in first four papers, find the minimum marks that she must score in the last paper to get grade A in the course.

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Solution

Let the required marks be x. Then

$(89 + 93 + 95 + 91 + x) \geq (90 \times 5) \Rightarrow x \geq 82$

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To receive grade A in a course one must obtain an average of 90 marks or more in five papers, each of 100 marks. If Tanvy scored 89, 93, 95 and 91 marks in first four papers, find the minimum marks that she must score in the last paper to get grade A in the course.

Let the required marks be x. Then (89+93+95+91+x)≥(90×5)⇒x≥82

Let the required marks be x. Then

$(89 + 93 + 95 + 91 + x) \geq (90 \times 5) \Rightarrow x \geq 82$