If x/y = 7/4, then (x + y)/(x - y) = ?
Answers
A) 5  B) 11 / 3  C) - 1 / 6  D) - 1 / 5  E) - 5

Rationale: "any x and y satisfying x / y = 7 / 4 should give the same value for ( x + y ) / ( x - y ) . say x = 7 and y = 4 , then ( x + y ) / ( x - y ) = ( 7 + 4 ) / ( 7 - 4 ) = 11 / 3 . answer : b ."
Answer: B