two - third of a positive number and 25 / 216 of its reciprocal are equal . the number is :
"let the number be x . then , 2 / 3 x = 25 / 216 * 1 / x x 2 = 25 / 216 * 3 / 2 = 25 / 144 x = 5 / 12 answer : a"
sqrt(divide(multiply(25, const_3), multiply(216, const_2)))