A rope is 8 meters long, first (1/5) of it is used up, and then (1/5) meter is used up, how many meters are left at this time?
一根绳子长8米，先用去了它的(1/5)，再用去了(1/5)米，这时还剩下多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 * (1/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">8 - (8/5) - (1/5)</gadget>
<output>31/5 = around 6.2</output>

<result>31/5 = around 6.2</result>