SOLUTION: An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 82, 64, and 98 on the first three exams. Write an inequality representing the sc

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Question 8496: An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 82, 64, and 98 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.
Hello i have tryed to work on this and it makes no sence at all...please help
Answer by Earlsdon(6287) (Show Source):
You can put this solution on YOUR website!
Let S be the score needed on the fourth test to bring her average to at least (>=) 70. If you add the three scores she already has to the fourth score (S) that she needs and divide the lot by 4, you will have the average score for the four tests. You can set up the required equation this way:

Subtract 61 from both sides.
Multiply both sides by 4.

She will need to score at least (>=) 36 on the fourth test to get at least an average of 70 for the course.