Question

Juan wants to have an average of 80 for his 4 exams. Each exam is scored on a scale of 0 to 100. His first three exam scores are: 85, 76, 84. What does Jose need to score on the 4th exam to have a mean of 80 on all 4 exams?

Answer 1

75

Explanation:

85 + 76 + 84 + x = 320

-> 245 + x = 320

-> -245 -245

-> x = 75