two - third of a positive number and 64 / 216 of its reciprocal are equal . the number is :
"let the number be x . then , 2 / 3 x = 64 / 216 * 1 / x x 2 = 64 / 216 * 3 / 2 = 64 / 144 = 4 / 9 x = 2 / 3 answer : d"
sqrt(divide(multiply(64, const_3), multiply(216, const_2)))