Question

You have taken four test and earned a 60, 95, 80, and 75. you want to keep your overall average at 80. Write and solve the equation you would use to find what you need to score on your fifth test to keep this average.

Answer 1

5th test = 90

Explanation:

Overall average= 80

80 = (60 + 95 +80 + 75 + a) / 5

400 = 310 + a

a = 400 - 310

a = 90 ( score for 5th test)