If (2/5) of a rope is used up, there are still 6 meters left; if it is sawed into the same small pieces on average, and sawed 4 times, how many meters is each piece long?
一根绳子，用去它的(2/5)，还剩6米；若把它平均锯成相同的小段，锯了4次，每段长多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<result>2</result>