Problem: the average age of 36 students in a group is 13 years . when teacher ' s age is included to it , the average increases by one . what is the teacher ' s age in years ?
Rationale: "explanation : age of the teacher = ( 37 * 14 - 36 * 13 ) years = 50 years . answer : e"
annotated_formula: add(36, const_1)