A student scores 60, 70, and 80 in three subjects. If he wants an average of 75

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Question: A student scores 60, 70, and 80 in three subjects. If he wants an average of 75 after scoring in a fourth subject, what should he score?

Options:

Correct Answer: 80

Solution:

Total score needed for average of 75 = 4 * 75 = 300. Current total = 60 + 70 + 80 = 210. Score needed in fourth subject = 300 - 210 = 90.

A student scores 60, 70, and 80 in three subjects. If he wants an average of 75

Practice Questions

A student scores 60, 70, and 80 in three subjects. If he wants an average of 75 after scoring in a fourth subject, what should he score?

Questions & Step-by-Step Solutions

A student scores 60, 70, and 80 in three subjects. If he wants an average of 75 after scoring in a fourth subject, what should he score?

Step 1: Understand that the average score is calculated by adding all scores and dividing by the number of subjects.
Step 2: The student has scores of 60, 70, and 80 in three subjects.
Step 3: Calculate the total score from the three subjects: 60 + 70 + 80.
Step 4: Add the scores: 60 + 70 = 130, then 130 + 80 = 210. So, the current total score is 210.
Step 5: The student wants an average of 75 after scoring in a fourth subject.
Step 6: To find the total score needed for an average of 75 with 4 subjects, multiply 75 by 4: 75 * 4 = 300.
Step 7: Now, subtract the current total score from the total score needed: 300 - 210.
Step 8: Calculate the difference: 300 - 210 = 90. This means the student needs to score 90 in the fourth subject.

Average Calculation – Understanding how to calculate the average score based on total scores and the number of subjects.
Total Score Requirement – Determining the total score needed to achieve a desired average across multiple subjects.
Subtraction for Score Needed – Calculating the score needed in the final subject by subtracting the current total from the required total.

A student scores 60, 70, and 80 in three subjects. If he wants an average of 75

What’s inside this PDF?

A student scores 60, 70, and 80 in three subjects. If he wants an average of 75

Practice Questions

Questions & Step-by-Step Solutions

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