Problem: two - third of a positive number and 16 / 216 of its reciprocal are equal . find the positive number .
Rationale: "explanation : let the positive number be x . then , 2 / 3 x = 16 / 216 * 1 / x x 2 = 16 / 216 * 3 / 2 = 16 / 144 x = √ 16 / 144 = 4 / 12 . answer : a"
annotated_formula: sqrt(divide(multiply(16, const_3), multiply(216, const_2)))