You need to work out how much you need for 1 flowerbed,
So, 15÷5= 3. 3 gallons =1 flowerbed
Then, 3 X 7 = 21 Gallons.
        
                    
             
        
        
        
Answer:
<7 = 47, 2x - 5 + 47 = 180, x = 69
Step-by-step explanation:
<5 and <7 are vertical angles, which means that they have the same degree. 
<7 + <6 = 180. <6 = 2x - 5. 2x - 5 + 47 = 180. 
Solve
2x - 5 + 47 = 180
2x + 42 = 180
2x = 138
x = 69