math
posted by pat .
if 40 percent of my grade is at a 97 percent average and 40 percent of my grade is at a 92 percent average and my final test is worth 20 percent of the grade then what do i have to score on my final test to have a grade of 91.5 percent or better?

let your final be x
.4(97) + .4(92) + .2x = 91.5
solve for x
I get 79.5 
It certainly pays to check your work! I just took a huge science test. I checked it over twice before I turned it in, and I got an A! My score was 94 out of 100! I figure that each time I checked it, I found half of the mistakes that were there at a time. What would have been my score if I had not checked my work?
Respond to this Question
Similar Questions

math
A bond has an average return of 6.8 percent and a standard deviation of 4.6 percent. What range of returns would you expect to see 68 percent of the time? 
Math  average grade
Does anyone know how to calculate average point grade? 
math
If you have a grade average at 50% and you score 89% percent on a test what does your grade equal out to? 
Statistics
I'm confused.Can someone tell me if I have done this correct.I'm trying to get the average using a weighted scale: TOTAL GRADES: WEIGHT 90% 5% 100% 15% 95% 15% 90% 5% 94.5% 60% I multiplied the total grade by the percent, then added … 
Math
I'm confused.Can someone tell me if I have done this correct.I'm trying to get the average using a weighted scale: TOTAL GRADES: WEIGHT 90%  5% 100% 15% 95%  15% 90% 5% 94.5% 60% I multiplied … 
Math
The percent grade of a highway is the amount that the highway raises or falls in a given horizontal distance. For example, a highway with a four percent grade rises 0.04 mile for every 1 mile of horizontal distance. a. How many feet … 
Math, Geometry
The percent grade of a highway is the amount that the highway raises or falls in a given horizontal distance. For example, a highway with a four percent grade rises 0.04 mile for every 1 mile of horizontal distance. a. How many feet … 
Algebra
In his mathematics class, John has taken 3 tests, each worth 20% of his total grade. His grades on those tests were 92%,83%,and 85%. He has an 100% average on his homework, worth 10% of his grade. All that remains is a final exam worth … 
Math, are they all right?
1. A student raises her grade average from a 75 to a 90. What was the percent of increase in the studentâ€™s grade average? 
News for Ms. Sue
1. A student raises her grade average from a 75 to a 90. What was the percent of increase in the studentâ€™s grade average?