On the last math test, murphy got an 82%. ralph got 20 of the 25 questions correct. who had the higher grade?

25/10=2.5*8=20
2.5/5=0.5

82%=20.5/25 marks
20/25 marks
Murphy has the higher grade

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

There is no image, or it's not working.