A store bought 15 boxes of table tennis balls, each packed in 8 boxes, and the total cost was 240 yuan. How much is an average table tennis ball?
某商店买了15盒乒乓球，每8个装一盒，一共用去了240元．平均每个乒乓球多少元？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">240 / 120</gadget>
<output>2</output>

<result>2</result>