I know that I have to use the "rule of three" when the relationship between the variables is direct and proportional. Identifying that the relationship is direct is easy; however, I don't know how to be sure that that the relationship is proportional. Is there a method or tecnique to confirm that?
For example,
If 7 candies represent the 35% of a bag of candies, how many candies are in the bag?
Common sense tells me that I have to use the rule of three:
7 ----- 35
x ----- 100
x = 20
Although that's the correct answer I was not sure that the relationship is proportional. How to confirm that in this problem and in more complex questions?
Thanks!
For example,
If 7 candies represent the 35% of a bag of candies, how many candies are in the bag?
Common sense tells me that I have to use the rule of three:
7 ----- 35
x ----- 100
x = 20
Although that's the correct answer I was not sure that the relationship is proportional. How to confirm that in this problem and in more complex questions?
Thanks!
