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

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Question: A student scores 70, 80, and 90 in three tests. If he wants an average of 85 after the fourth test, what must he score?

Options:

Correct Answer: 95

Solution:

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

A student scores 70, 80, and 90 in three tests. If he wants an average of 85 after the fourth test, what must he score?

A student scores 70, 80, and 90 in three tests. If he wants an average of 85 after the fourth test, what must he score?

Step 1: Understand that the average score is calculated by adding all the scores together and dividing by the number of tests.
Step 2: The student has taken 3 tests and wants to find out what score he needs on the 4th test to achieve an average of 85.
Step 3: Calculate the total score needed for an average of 85 after 4 tests. This is done by multiplying the desired average (85) by the number of tests (4). So, 85 * 4 = 340.
Step 4: Calculate the current total score from the first three tests. Add the scores: 70 + 80 + 90 = 240.
Step 5: To find out what score is needed on the 4th test, subtract the current total score (240) from the total score needed (340). So, 340 - 240 = 100.
Step 6: The student must score 100 on the 4th test to achieve an average of 85.

Average Calculation – Understanding how to calculate the average score by dividing the total score by the number of tests.
Total Score Requirement – Determining the total score needed to achieve a desired average over a set number of tests.
Basic Arithmetic – Performing addition and subtraction to find the required score for the fourth test.