A, B, C, and D are all natural numbers. If A*B=15, B*C=20, A*D=24, then C*D=how much.
A、B、C、D均为自然数，若A*B=15，B*C=20，A*D=24，那么C*D=多少．
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<result>32</result>