How much is it to combine 72-12=60 and 60/4=15 into one comprehensive formula.
把72-12=60，60/4=15合并成一道综合算式是多少．
<gadget id="calculator">72 - 12</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>