The stationery store shipped 8 boxes of small balls, each with 60 pieces. After selling one batch, there were 150 left. How many small balls were sold?
文具店运到8箱小皮球，每箱60只，卖掉一批后，还剩150只，卖掉了多少只小皮球？
<gadget id="calculator">60 * 8</gadget>
<output>480</output>

<gadget id="calculator">480 - 150</gadget>
<output>330</output>

<result>330</result>