The school bought football and basketball for a total of 1680 yuan. Among them, 15 basketballs were bought at 68 yuan each, and 12 footballs were bought. How much is each? (Solution of column equation)
学校买足球、篮球共用去1680元，其中篮球买了15个，每个68元，足球买了12个，每个多少元？(列方程解)
<gadget id="calculator">68 * 15</gadget>
<output>1_020</output>

<gadget id="calculator">1_680 - 1_020</gadget>
<output>660</output>

<gadget id="calculator">660 / 12</gadget>
<output>55</output>

<result>55</result>