Mr. Wang brought 900 yuan to buy footballs. He bought 18 and left 36 yuan. How much is each football?
王老师带900元钱买足球，买了18个，还剩下36元，每个足球多少元？
<gadget id="calculator">900 - 36</gadget>
<output>864</output>

<gadget id="calculator">864 / 18</gadget>
<output>48</output>

<result>48</result>