if a and b are positive numbers , and a ^ 3 + b ^ 3 = 30 , then the greatest possible value of a is between :
"if a = 3.1 and b is very small , then a ^ 3 + b ^ 3 can equal 30 . if a > 4 , then a ^ 3 + b ^ 3 > 30 . the answer is b ."
add(multiply(floor(power(30, inverse(3))), const_10), add(floor(power(30, inverse(3))), const_1))