wire is 32 meters long, 20% of the total length was used for the first time, and (7/10) of the total length was used for the second time. How many meters are shared between two trips?
一根电线全长32米，第一次用去了全长的20%，第二次用去了全长的(7/10)．两次共用去多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(1/5) + (7/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">32 * (9/10)</gadget>
<output>144/5 = around 28.8</output>

<result>144/5 = around 28.8</result>