SOLUTION: If your chemistry grades are 84, 86, and 88 for the first three marking periods, what do you need to score in the fourth marking period to obtain a 90 overall average?

SOLUTION: If your chemistry grades are 84, 86, and 88 for the first three marking periods, what do you need to score in the fourth marking period to obtain a 90 overall average?

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Question 1064403: If your chemistry grades are 84, 86, and 88 for the first three marking periods, what do you need to score in the fourth marking period to obtain a 90 overall average?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
To obtain a 90 overall average for 4 test, you need 90 x 4, or 360 total points. Thus far, you have 84+86+88=258 total points. 360-258=102 points needed to score on the 4th examination to average 90 points.
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