If a and b are positive real numbers, and a^3 + b^3 = 20, then the greatest possible value of a is between: Choose the correct choice:
A) 0 and 3 B) 3 and 4 C) 4 and 5 D) 5 and 7 E) 7 and 9
If a &gt; 3, then a^3 + b^3 &gt; 20.   The answer is 0 and 3.
<result>A</result>
If a and b are positive real numbers, and a^3 + b^3 = 20, then the greatest possible value of a is between: