A student scored 80, 90, 70, and 60 in four subjects. What score does he need in

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Question: A student scored 80, 90, 70, and 60 in four subjects. What score does he need in the fifth subject to have an average of 75?

Options:

Correct Answer: 80

Solution:

Total required for average of 75 = 5 * 75 = 375. Current total = 80 + 90 + 70 + 60 = 300. Required score = 375 - 300 = 75.

A student scored 80, 90, 70, and 60 in four subjects. What score does he need in the fifth subject to have an average of 75?

A student scored 80, 90, 70, and 60 in four subjects. What score does he need in the fifth subject to have an average of 75?

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 in 4 subjects: 80, 90, 70, and 60.
Step 3: Calculate the total score of the 4 subjects by adding them: 80 + 90 + 70 + 60.
Step 4: The total score from Step 3 is 300.
Step 5: To find out what score is needed in the 5th subject for an average of 75, first calculate the total score needed for 5 subjects: 5 * 75.
Step 6: The total score needed from Step 5 is 375.
Step 7: Now, subtract the current total score (300) from the total score needed (375) to find the required score for the 5th subject: 375 - 300.
Step 8: The result from Step 7 is 75, which is the score needed in the 5th 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 specific average.
Basic Arithmetic – Performing addition and subtraction to find the required score.