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A student scores 80, 90, and 70 in three subjects. If he wants an average of 85

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Question: A student scores 80, 90, and 70 in three subjects. If he wants an average of 85 after scoring in a fourth subject, what should he score?

Options:

  1. 90
  2. 95
  3. 100
  4. 85

Correct Answer: 95

Solution: 

Total score needed for average of 85 = 4 * 85 = 340. Current total = 80 + 90 + 70 = 240. Required score = 340 - 240 = 100.

A student scores 80, 90, and 70 in three subjects. If he wants an average of 85

Practice Questions

Q1
A student scores 80, 90, and 70 in three subjects. If he wants an average of 85 after scoring in a fourth subject, what should he score?
  1. 90
  2. 95
  3. 100
  4. 85

Questions & Step-by-Step Solutions

A student scores 80, 90, and 70 in three subjects. If he wants an average of 85 after scoring in a fourth subject, what should he score?
Correct Answer: 100
  • Step 1: Understand that the average score is calculated by adding all the scores together and then dividing by the number of subjects.
  • Step 2: The student has scores of 80, 90, and 70 in three subjects.
  • Step 3: Calculate the total score from the three subjects: 80 + 90 + 70.
  • Step 4: Add the scores: 80 + 90 = 170, then 170 + 70 = 240. So, the current total score is 240.
  • Step 5: The student wants an average of 85 after scoring in a fourth subject. To find the total score needed for this average, multiply the average (85) by the number of subjects (4): 4 * 85.
  • Step 6: Calculate 4 * 85, which equals 340. This is the total score needed for an average of 85.
  • Step 7: To find out what score the student needs in the fourth subject, subtract the current total score (240) from the total score needed (340): 340 - 240.
  • Step 8: Calculate 340 - 240, which equals 100. Therefore, the student needs to score 100 in the fourth subject.
  • Average Calculation – Understanding how to calculate the average score by dividing the total score by the number of subjects.
  • Total Score Requirement – Determining the total score needed to achieve a desired average by multiplying the average by the number of subjects.
  • Score Difference – Calculating the difference between the required total score and the current total score to find the score needed in the next subject.
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