SOLUTION: an average score of 90 or above in an english course receives an A grade. a student has grades of 85, 88, 90, and 98 on four tests. find the range of scores on the fifth test that

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Question 168697: an average score of 90 or above in an english course receives an A grade. a student has grades of 85, 88, 90, and 98 on four tests. find the range of scores on the fifth test that will give the student an A grade
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
We'll go to the Least score which is "90" to get "A" Grade
Average=90=A -----> system%28G1=85%2CG2=88%2CG3=90%2CG4=98%2CG5=G5%29
%28G%5B1%5D%2BG%5B2%5D%2BG%5B3%5D%2BG%5B4%5D%2BG%5B5%5D%29%2F5=90, EQN 1
%2885%2B88%2B90%2B98%2BG%5B5%5D%29%2F5=90, cross multiply
361%2BG%5B5%5D=90%2A5=450
G%5B5%5D=450-361
highlight%28G%5B5%5D=89%29 -----> Final score to have "A" Grade
Check it out in EQN 1:
%2885%2B88%2B90%2B98%2Bhighlight%2889%29%29%2F5=90
450%2F5=90
90=90
Thank you,
Jojo