How much is it to combine the three formulas of 34.15+38.25=72.4; 113-72.4=40.6; 40.6/2=20.3 into a comprehensive formula.
把34.15+38.25=72.4；113-72.4=40.6；40.6/2=20.3这三个算式合成一个综合算式是多少．
<gadget id="calculator">34.15 + 38.25</gadget>
<output>72.4</output>

<gadget id="calculator">113 - 72.4</gadget>
<output>40.6</output>

<gadget id="calculator">40.6 / 2</gadget>
<output>20.3</output>

<result>20.3</result>