Answer:
<em>4/2 </em>is the ratio and the diameter is <em>2</em>
Step-by-step explanation:
<em>4/2 </em>is a fraction and <em>2 </em>is when you divide 4/2. Correct me if I am wrong.
 
        
             
        
        
        
To find the answer, you have to set each one equal to each other.
(160 + 40x = 55x)
Now, you just solve for X.
55x - 40x = 15x
160 / 15 = 15 / 15x
This means 160/15 = x, or is equal to
10 2/3