Zhang Li and Li Ning bought a box of apples with the same amount of money. Zhang Li takes 8 kilograms, Li Ning takes 12 kilograms, and Li Ning wants to give Zhang Li 16 yuan. Ask: How much is an apple per kilogram?
张力和李宁用同样多的钱共买一箱苹果．张力拿8千克，李宁拿12千克，李宁要给张力16元，问：每千克苹果多少元？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>