Problem: a , b and c have rs . 400 between them , a and c together have rs . 200 and b and c rs . 350 . how much does c have ?
Rationale: "a + b + c = 400 a + c = 200 b + c = 350 - - - - - - - - - - - - - - a + b + 2 c = 550 a + b + c = 400 - - - - - - - - - - - - - - - - c = 150 answer : a"
annotated_formula: subtract(add(200, 350), 400)