A number has divisor 5, is a multiple of 3, and can be divisible by 2 at the same time. What is the smallest number?
一个数有约数5，又是3的倍数，同时又能被2整除，这个数最小是多少．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>