Question

The minimum mark to obtain a Grade A is 75. Cheryn managed to achieve an average of Grade A for three of her English quizzes. What is the minimum mark she scored in her first quiz if scored 76 and 89 marks in her second and third quiz, respectively?​

Answer 1

9514 1404 393

Answer:

60

Explanation:

Let m represent the mark Cheryn scored on her first quiz. Then her average is ...

(m +76 +89)/3 ≥ 75

m +165 ≥ 225 . . . . . . . . multiply by 3

m ≥ 60 . . . . . . . . . . . . subtract 165

Cheryn scored a minimum of 60 marks on her first quiz.