Naughty, Dingdang, and Mingming bought 15 lollipops and shared them equally. Naughty paid for 9 lollipops, and Dingdang paid for 6 lollipops. They obviously didn’t bring any money and waited to eat. After the calculation, it is obvious that 5 yuan should be taken out, and how much money should be recovered when naughty.
淘气、叮铛、明明三人一起买了15个棒棒糖平分着吃，淘气付了9个棒棒糖的钱，叮铛付了6个棒棒糖的钱，明明没带钱，等吃完后一算，明明应拿出了5元钱，淘气应收回多少元钱．
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">9 * 1</gadget>
<output>9</output>

<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>