Question

Rueben has scores of 70, 75, 83, 80 on four Spanish quizzes. What score must he get? on the next quiz to achieve a quiz average of at least 80?

Answer 1

92

Explanation:

let 'q' = score on last quiz

70 + 75 + 83 + 80 + q ≥ 80

5

cross-multiply:

308 + q ≥ 5(80)

308 + q ≥ 400

q ≥ 92