Problem: if x / y = 7 / 4 , then ( x + y ) / ( x - y ) = ?
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 ."
annotated_formula: divide(add(7, 4), subtract(7, 4))