SOLUTION: If I have an average of a 72 and I will take a test that's worth 20%. What grade do I need to get on my test in order for my average to be 80 or above?

Question 817232: If I have an average of a 72 and I will take a test that's worth 20%. What grade do I need to get on my test in order for my average to be 80 or above?

Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
if the test is worth 20% then the present average is worth 80%
.80*72+.2x>=80
57.6 +.2 x>=80
your 72 average is only worth 57.6 you need to get 20% of the test that is worth 22.4
You will need to get 112 on the test
to get 75 you will need 87
with a grade of 100 on the test you would get a total 77.6
RELATED QUESTIONS
If I have a 72% average and took a 100 point test worth 40% of my grade what do I need to (answered by richwmiller)

I have a test that is worth 40% of my final grade. I have a 64% in the class right now.... (answered by Alan3354)

If I have a average of 89 and I get a zero on a test, test are worth 50% of your grade... (answered by Fombitz)

I need an average of 80, I currently have a 77. I'm taking a test with 20 questions, what (answered by richard1234)

If I have a 63% in a class and my final test is worth 20% of my grade. What will I have... (answered by jim_thompson5910)

if i have a 94 average and i get a 84 on a test worth 20%of my grade what is my grade (answered by richwmiller)

If I have an average of 98% in the class. What is the lowest grade I can get on my final... (answered by Alan3354)

If I have a 63% in a class and I get a 100% on a test that is worth 70% of my grade, what (answered by Alan3354)

If I have an 88 average in a class and I get to take an exam that is 10% of my grade,... (answered by Alan3354)