Answer :
x = 96 (higher grade)
y = 80 (lower grade)
x - y = 16
1/8x + 1/2y = 52
x - y = 16
+y = +y
x = y + 16
1/8(y + 16) + 1/2y = 52
1/8y + 2 +1/2y = 52
5/8y + 2 = 52
-2 -2
5/8y = 50
/(5/8) (5/8)
y = 80
x - y = 16
x - 80 = 16
+80 = +80
x = 96
y = 80 (lower grade)
x - y = 16
1/8x + 1/2y = 52
x - y = 16
+y = +y
x = y + 16
1/8(y + 16) + 1/2y = 52
1/8y + 2 +1/2y = 52
5/8y + 2 = 52
-2 -2
5/8y = 50
/(5/8) (5/8)
y = 80
x - y = 16
x - 80 = 16
+80 = +80
x = 96