SOLUTION: to get a B in math,a student must score an average of 80 on five tests. On the first four tests, the scores were 75, 90, 73, and 75. What is the lowest score that the student can g

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Question 618780: to get a B in math,a student must score an average of 80 on five tests. On the first four tests, the scores were 75, 90, 73, and 75. What is the lowest score that the student can get on the last test and still get a B?
Found 2 solutions by ewatrrr, richwmiller:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
first four tests, the scores were 75, 90, 73, and 75.
What is the lowest score that the student can get on the last testhighlight%28x%29 and still get a B?
to get a B in math,a student must score an average of 80 on five tests.
(75+90+73+75+highlight%28x%29)/5 ≥ 80
75+90+73+75+x ≥ 400
313 + x ≥ 400
x ≥ 87
87 the lowest score that the student can get and still get a B


Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(75+90+73+75+x)/5=80
solve for x
x=87
or
75 misses 80 by -5
90 exceeds by 10
73 -7
75 -5
-5+10-7-5
-7
must get 80+7=87