SOLUTION: Your grades on four examples are 78, 85, 97 and 92. What grade do you need on the next exam to have an average of 90 on the five exams
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Question 642477: Your grades on four examples are 78, 85, 97 and 92. What grade do you need on the next exam to have an average of 90 on the five exams Answer by Century(7) (Show Source):
You can put this solution on YOUR website! Your grades on four examples are 78, 85, 97 and 92. What grade do you need on the next exam to have an average of 90 on the five exams.
Let x = the score needed on the fifth exam, then .
To solve this equation you would first want to multiply both sides of the equation by 5 to get
You would now add the 4 numbers together to get
Subtract 352 from both sides:
Therefore the score on the fifth test must be 98 in order to have an average of 90 on the five exams
