Xinhua Bookstore shipped a batch of "Snow White", and sold an average of 15 copies a day in July, leaving 120 copies left. How many copies of Snow White are in this batch?
新华书店运来一批《白雪公主》，七月份平均每天卖15本，还剩120本．这批《白雪公主》有多少本？
<gadget id="calculator">15 * 31</gadget>
<output>465</output>

<gadget id="calculator">465 + 120</gadget>
<output>585</output>

<result>585</result>