Afund drive announces that it has raised 4376 which is 20% of its goal. how much more must be raised?

You can solve this problem as follows:
 
 1. Let's call the amount: "y".
 
 2. The exercise says that 4376 which is 20% of its goal, so we have:
 
 y=4376
 20% of its goal=4376
 
 3. Then, we have the equation below:
 
 20y/100=4376
 0.20y=4376
 
 4. When we clear the variable "y", we obtain:
 
 y=4376/0.20
 y=21880
 
 5. Finally, we will have:
 
 21880-4376=17504
 
 6. How much more must be raised?
 
 The anwer is: 17504