SOLUTION: Jim has taken 5 tests and his average is 84, if he gets a 100%, a perfect score on his next three text what will be his new average?

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Question 693129: Jim has taken 5 tests and his average is 84, if he gets a 100%, a perfect score on his next three text what will be his new average?
Found 2 solutions by Alan3354, DrBeeee:
Answer by Alan3354(69443) (Show Source):
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Jim has taken 5 tests and his average is 84, if he gets a 100%, a perfect score on his next three text what will be his new average?
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(5*84 + 3*100)/(5 + 3) = 720/8
= 90

Answer by DrBeeee(684) (Show Source):
You can put this solution on YOUR website!
The average grade is the sum of grades divided by the number of grades. Your student has an 84 (out of 100) average for 5 grades, so the sum of the first five grades is
(1) sum = 5*84 or
(2) sum = 420
Now when the student scores 100 on each of the next three tests his new sum is
(3) new sum = 420 + 100 + 100 + 100 or
(4) new sum = 720
Now he has 8 grades, so his/her new average is
(5) new average = 720/8 or
(6) new average = 90
Answer: The student's new average will be 90%.