So we know the tank already has 5 gallons and we need 9. This means we need 4 more gallons in order to fill up the tank.
If 1/4 gallon is being filled per minute we need to find out how many 1/4 gallons makes up 4 gallons in total.
4 of the 1/4 gallons makes up 1 whole gallon. So since we need 4 whole gallons we would need 16 of the 1/4 gallons. 
This means that it will take 16 minutes for the tank to hold 9 gallons of water. 
        
                    
             
        
        
        
Answer:
Ummmm what’s the question?
Step-by-step explanation:
I will edit after you tell me what your question is.
Btw God bless you.have a great day!
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
Correct me is I'm wrong but I believe its a independent variable.
 
        
             
        
        
        
Ratio in which 180 should be divided is 4:5:9
firstly we need to find the total number of portions 
this we can find by adding all the numbers making up the ratio 
4 + 5 + 9 = 18
180 is made of 18 portions 
size of 1 portion = 180 / 18 = 10
when dividing 180 into the respective ratio 4:5:9 the portions are as follows
4 x 10 = 40
5 x 10 = 50
9 x 10 = 90
therefore when we divide 180 in the ratio 4:5:9
the answer we get is
40 :50: 90
        
                    
             
        
        
        
<h2>Solution :- </h2>
Let the number be "x" , then according to the question : 
• 2x - 12 = -8 
Further solving 
→ 2x = -8 + 12 
→ 2x = 4 .
→ x = 2