word problem, Im lost on how to set this up
posted by Carlos .
Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to
a) Get a C average on exams?
f
b) Get a B average on exams?
f
c) Get an A average on exams?
f
< > or = to

word problem, Im lost on how to set this up 
Ms. Sue
84 + 89 + 90 = 263 points
400 = total possible points
0.7 * 400 = 280 needed for a C
0.8 * 400 = _____ needed for a B
0.9 * 400 = _____ needed for an A 
word problem, Im lost on how to set this up 
Carlos
sorry but I did not, I worked out what you posted and entered them in online and my answers were rejected.
ps. i didn't realize I could respond to you on this 
word problem, Im lost on how to set this up 
Ms. Sue
You didn't complete the problem.
For a C, 280 points are needed. Since Joe already has 263 points, he only needs 17 points on the last test for a C.
For a B, 320 points are needed.
320  263 = 57 needed
For an A  360 points are needed.
360  263 = ? 
word problem, Im lost on how to set this up 
Carlos
ahh now I see it! 17, 57, 97. not sure what I was thinking there. Thanks for your help!

word problem, Im lost on how to set this up 
Ms. Sue
You're very welcome.
Respond to this Question
Similar Questions

math
wai ling averaged 84 on her first three exams and 82 on her next 2 exams.what grade must she obtain on her sixth test in order to average 85 for all six exams? 
math
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last … 
statistics?mean average with lowest number out?
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last … 
statistics?mean average with lowest number out?
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last … 
Statistic Average
A mean average of 60 on 6 exams is needed to pass a course. on his first 5 exams, Adam received grades of 46,73,73,63 and 70. If the lowest grade of the exams already taken is to be dropped, what grade must he receive on his last exam … 
math
Scott had an average of 83 on his first three exams. He later scored an average of 92 on the next six exams. What is his average for all nine exams. Round to the nearest tenth if necessary. 
algebra
Mike needs at least a 75% average to pass his math course. The class contains 5 exams that are equally weighted. If he scored a 64%, 86%, 71%, and a 90% on the first 4 exams, what score does he need on the final exam to earn at least … 
math
a studentâ€™s grade in a class is simply the mean of five 100point exams a. If the student has grades of 77, 73, 97, and 89 on the first four exams, what is the studentsâ€™ grade before taking the last exam? 
Math
WebWork = 28% Four exams = 6% each A final = 28% Labwork = 20% Suppose you obtain 100 percent credit on all WeBWorK assignments for this class. What is the minimum average percentage on the exams and labwork that will still get you … 
word problem, please
Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to a) Get a C average …