There is a 20-meter-long rope, (9/8) meters are used for the first time, (11/8) meters are used for the second time, (5/2) meters are used for the third time, how many meters are used for the three times ?
有一根20米长的绳子，第一次用去(9/8)米，第二次用去(11/8)米，第三次用去(5/2)米，三次一共用去多少米？
<gadget id="calculator">9 / 8</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">11 / 8</gadget>
<output>11/8 = around 1.375</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(9/8) + (11/8) + (5/2)</gadget>
<output>5</output>

<result>5</result>