Problem: a student gets 55 % in one subject , 65 % in the other . to get an overall of 55 % how much should get in third subject .
Rationale: "let the 3 rd subject % = x 55 + 65 + x = 3 * 55 120 + x = 165 x = 165 - 120 = 45 answer : c"
annotated_formula: subtract(multiply(55, const_3), add(55, 65))