The ice cream is 1 part cashew, 3 parts marshmallow, and 36 parts chocolate ice cream. That's a total of 40 parts. So the fraction that is chocolate ice cream is:
36/40 = 0.9
So 90% of Heavenly Hash ice cream is chocolate ice cream.
x is the number of months and he originally had 25 coins. The correct representation of this equation would be y=8x+25 since he adds 8 coins every month. So, G does not show the relationship.