How much is it to combine the three formulas of 72-12=60, 15+5=20, and 60/20=3 into one comprehensive formula.
把72-12=60，15+5=20，60/20=3这三个算式合并成一个综合算式是多少．
<gadget id="calculator">72 - 12</gadget>
<output>60</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<result>3</result>