The ratio of two numbers is 1:3 and the sum of their cubes is 945. The difference of number is?  Pick one.
A) 5.23	B) 1.23	C) 3.93	D) 3.23	E) 4.23
1x 3x   1x cube + 27x cube = 945   28x cube = 945   x cube = 33.75 =&gt; x = 3.23   ANSWER:3.23
<result>D</result>
The ratio of two numbers is 1:3 and the sum of their cubes is 945. The difference of number is?