Composite calculation: add 35 to 80% of 60, what is half of the sum?
列综合式计算：60的80%加上35，所得的和的一半是多少？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<gadget id="calculator">48 + 35</gadget>
<output>83</output>

<gadget id="calculator">83 / 2</gadget>
<output>83/2 = around 41.5</output>

<result>83/2 = around 41.5</result>