If 8 meters are cut from a section of cloth, there is still (5/7) of this section of cloth, how many meters are left?
一段布剪去8米，还剩这段布的(5/7)，还剩多少米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">8 / (2/7)</gadget>
<output>28</output>

<gadget id="calculator">28 * (5/7)</gadget>
<output>20</output>

<result>20</result>