If (5/6) of a piece of cloth is used up, there are still 13 meters left. If (2/3) of it is used up, how many meters are left?
一块布用去它的(5/6)还剩下13米，若用去它的(2/3)，还剩下多少米？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">13 / (1/6)</gadget>
<output>78</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">78 * (1/3)</gadget>
<output>26</output>

<result>26</result>