SOLUTION: Sarah has gotten scores of 83, 76, and 69 on her first three tests. What score must she get on her fourth test to keep an average of 81 or greater.
fourth test = x
x = (83 +
Algebra.Com
Question 260539: Sarah has gotten scores of 83, 76, and 69 on her first three tests. What score must she get on her fourth test to keep an average of 81 or greater.
fourth test = x
x = (83 + 76 + 69)/3
x = 76
Is this correct?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
These are the first three tests: 83, 76, and 69
we want an average of 81 over 4 tests. Think totals.
81 x 4 = 324.
She needs 324 points for an 81 average
right now we have our three tests adding to 228
by subtracting 324 - 228 we get 96.
So, she needs 96 on the fourth test to get 81 %
--
alternate method: compare all scores to 81 and look at over (+) and under (-)
83: +2
76: -5
69: -12
this gives us - 15. SHe needs +15 to get 81, so, add this to 81: 81 + 15 = 96
RELATED QUESTIONS
Sarah has gotten scores of 83, 76, and 69 on her first three tests. What score must she... (answered by checkley77)
Jackie has grades of 83, 76, and 65 on her first three algebra tests. If she wants an... (answered by Fombitz)
The average of Cindy's threes test scores must be greater than 70 for her to pass the... (answered by richwmiller)
Jocelyn has test scores of 75, 83 and 91 on her first three Algebra tests. What will she... (answered by rfer)
Sarah has grade of 99 and 69 on her first two tests. If she wants an average of at least... (answered by checkley77)
Thad has scores of 87, 83, and 80 on his first three algebra tests. What score must he... (answered by jim_thompson5910)
Shania has scores of 76 and 81 on her first two tests. If she wants an average of at... (answered by solver91311)
If Katie scores an 80,83 and an 88 on her first 3 tests, what must she score in her... (answered by ikleyn,greenestamps)
If Katie scored an 80, 83, and an 88 on her first
three tests, what must she score on... (answered by MathLover1,greenestamps)