Problem: when 1 is added to half of one - third of one - fifth of a number , the result is one - fifteenth of the number . find the number ?
Rationale: "explanation : let the number be 1 + 1 / 2 [ 1 / 3 ( a / 5 ) ] = a / 15 = > 1 = a / 30 = > a = 30 answer : a"
annotated_formula: divide(const_3.0, divide(divide(const_1, multiply(const_3, add(const_2, 1))), const_2))