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A student scores 80, 85, and 90 in three subjects. If he wants an average of 85, what score does he need in the fourth subject?

Practice Questions

1 question
Q1
A student scores 80, 85, and 90 in three subjects. If he wants an average of 85, what score does he need in the fourth subject?
  1. 80
  2. 85
  3. 90
  4. 95

Questions & Step-by-step Solutions

1 item
Q
Q: A student scores 80, 85, and 90 in three subjects. If he wants an average of 85, what score does he need in the fourth subject?
Solution: Let the fourth score be x. (80 + 85 + 90 + x) / 4 = 85. Therefore, 255 + x = 340, so x = 85.
Steps: 0

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