A student scored 80, 90, and 70 in three subjects. What score does he need in th

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Question: A student scored 80, 90, and 70 in three subjects. What score does he need in the fourth subject to have an average of 85?

Options:

Correct Answer: 95

Solution:

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

A student scored 80, 90, and 70 in three subjects. What score does he need in the fourth subject to have an average of 85?

A student scored 80, 90, and 70 in three subjects. What score does he need in the fourth subject to have an average of 85?

Step 1: Understand that to find the average score, you need to add all the scores together and then divide by the number of subjects.
Step 2: The student wants an average of 85 over 4 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 the student already has: 80 + 90 + 70. 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: So, 340 - 240 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 – Knowing how to determine the total score needed to achieve a desired average by multiplying the average by the number of subjects.
Basic Arithmetic – Performing addition and subtraction to find the required score.