Grade Calculator: Find GPA & Subject Grades

[smiley4080]

Hello ,

I need some help>>>

I try to make Grade calculator The student must enter his expected GPA and the number of credit hours than the calculator must find the grade (e.g A,B+,B,...etc) in each subject

for example if I want to get 3.7 in this semester and I took 3subject with 3,4,8 hours respectively what's the grade that I must get in each.

I try to find an equation that will help me

but I get fail because I try manythings and many equation and formula but nothing work

So can you please help me?

Thanks

 

[phinds]

for example if I want to get 3.7 in this semester and I took 3subject with 3,4,8 hours respectively what's the grade that I must get in each.

3.7 in each will work as will anything that give a 3.7 average. Do you not know how to take a weighted average?

There is no ONE answer but a multitude of combinations.

 

[HallsofIvy]

Assuming that grades in each class are integer values, then you have the Diophantine equation
30x+ 40y+ 80z= 555. x= y= z= 3.7 is not a valid solution but there still may be many solutions.

 

[phinds]

Assuming that grades in each class are integer values, then you have the Diophantine equation
30x+ 40y+ 80z= 555. x= y= z= 3.7 is not a valid solution but there still may be many solutions.

Very good point. I was assuming fine granularity in the grading system, which of course may not be the case. smiley4080, the number of solutions will go up as the granularity of the grading system becomes finer. Probably I should say that the number of solutions will LIKELY go up as the ... since it COULD still be possible that there is only one combination. Clearly if the granularity is .1 points, then you can have 3.7 in each.

 

[smiley4080]

I know it me there are many possible answer but I need other formula which I used
I used the formula of how to get GPA to get one of possible answer but I thing is not correct way