A number is a multiple of 3, a multiple of 5, and a factor of 7. What is the smallest number.
一个数是3的倍数，又是5的倍数，还有因数7．这个数最小是多少．
<gadget id="calculator">3 * 5 * 7</gadget>
<output>105</output>

<result>105</result>