Mom bought 3 boxes of apples, each weighing 12 kilograms, and the total cost was 108 yuan. How much is an average apple per kilogram?
妈妈买了3箱苹果，每箱12千克，一共用了108元．平均每千克苹果多少元．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">108 / 36</gadget>
<output>3</output>

<result>3</result>