Problem: the average salary per head of the entire staff of an office including the officers and clerks is rs . 90 . the average salary of officers is rs . 500 and that of the clerks is rs . 84 . if the number of officers is 2 , find the number of officers in the office ?
Rationale: "500 84 \ / 90 / \ 6 410 3 : 205 3 - > 12 205 - > ? 820 answer : c"
annotated_formula: divide(90, add(84, add(const_3, const_3)))