A number that has a factor of 3 and is a multiple of 2 and 5 at the same time, what is the smallest number.
一个数，既含有因数3，同时又是2和5的倍数，这个数最小是多少．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>