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A student scores 70, 80, and 90 in three subjects. If he wants to achieve an ave

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Question: A student scores 70, 80, and 90 in three subjects. If he wants to achieve an average of 85 after the fourth subject, what score does he need in the fourth subject?

Options:

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

Correct Answer: 95

Solution: 

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

A student scores 70, 80, and 90 in three subjects. If he wants to achieve an ave

Practice Questions

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

Questions & Step-by-Step Solutions

A student scores 70, 80, and 90 in three subjects. If he wants to achieve an average of 85 after the fourth subject, what score does he need in the fourth subject?
  • Step 1: Understand that the average score is calculated by adding all the scores together and dividing by the number of subjects.
  • Step 2: The student wants an average of 85 after four subjects.
  • Step 3: To find the total score needed for an average of 85, multiply 85 by 4 (the number of subjects). This gives you 340.
  • Step 4: Now, add the scores from the first three subjects: 70 + 80 + 90. This equals 240.
  • Step 5: To find out what score is needed in the fourth subject, subtract the current total score (240) from the total score needed (340).
  • Step 6: Calculate 340 - 240, which equals 100. This means 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 specific average by multiplying the desired average by the number of subjects.
  • Subtraction for Required Score – Calculating the score needed in the final subject by subtracting the current total score from the total score required.
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