If a:b = 4:1, then find (a - 3b)/(2a - b)?
Options
A) 6 / 7 B) 1 / 7 C) 5 / 7 D) 3 / 2 E) 4 / 7

Rationale: answer : option b a / b = 4 / 1 = > a = 4 b ( a - 3 b ) / ( 2 a - b ) = ( 4 b - 3 b ) / ( 8 b - b ) = b / 7 b = > 1 / 7
Answer: B