Subtract the sum of 21.9 and 15.03 from 60, what is the difference?
从60里面减去21.9与15.03的和，差是多少？
<gadget id="calculator">21.9 + 15.03</gadget>
<output>36.93</output>

<gadget id="calculator">60 - 36.93</gadget>
<output>23.07</output>

<result>23.07</result>