Question

8. There are three exams in a marking period. A student received grades of 75 and 81

on the first two exams. What grade must the student earn on the last exam to get an
average of no less than 80 for the marking period?

Answer 1

85

Explanation:

Set up algebraic equation: (75+81+x)/3 ≥ 80

Multiply by 3 on both sides: 75+81+x ≥ 240

Subtract 75 and 81 from both sides: x ≥ 85