Question

Marie scored 95,86 and 89 on three science tests she wants her average score for 6 test to be at least 90 what inequality can you write to find the average scores that she can get on her next three test to meet this goal? Use s to represent the lowest average score

Answer 1

(3s + 270) / 6 > 90

s = 90; lowest average score

95+86+89 = 270

(3s + 270) / 6 > 90
* 6 * 6
3s + 270 > 540
- 270 -270
3s > 270
÷3 ÷3
s > 90

To check:

(3s + 270)/6 > 90
(3(90) + 270)/6 > 90
(270 + 270)/6 > 90
540 / 6 > 90
90 > 90