SOLUTION: There are three exams in a marking period. A student received grades of 86 and 92 on the first two exams. What grade must the student earn on the last exam to get an average of no

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Question 629231: There are three exams in a marking period. A student received grades of 86 and 92 on the first two exams. What grade must the student earn on the last exam to get an average of no less than 90 for the marking period?
Equation to find their average (let x be their last test grade) _______________
The lowest grade they could make _______________________
Please help?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
If you spent more time thinking about the problem than wasting time with fill in the blanks, you might be able to do your own homework.
(86+92+x)/3>=90
(86+92+x)>=270
178+x>=270
x>=92
another way to look at it.
86 misses 90 by 4 (-4)
92 is pass 90 by 2 (+2)
+2-4=-2
You have to make up 2 points so add them to 90
90+2=92 minimum.