If a:b = 4:1, then find (a - 3b)/(2a - b)?  Choose the correct answer:
A) 6/7
B) 1/7
C) 5/7
D) 3/2
E) 4/7
Answer: Option 1/7   a/b = 4/1 =&gt; a = 4b   (a - 3b)/(2a - b) = (4b - 3b)/(8b - b)   = b/7b =&gt; 1/7
<result>B</result>
If a:b = 4:1, then find (a - 3b)/(2a - b)?