when 3 is added to half of one - third of one - fifth of a number , the result is one - fifteenth of the number . find the number ?
explanation : let the number be 3 + 1 / 2 [ 1 / 3 ( a / 5 ) ] = a / 15 = > 3 = a / 30 = > a = 90 answer : e
divide(3, divide(divide(const_1, multiply(const_3, add(const_2, const_3))), const_2))