A wire, after cutting off the full length (1/3) of 3 meters, there is still 15 meters left, how many meters is this wire originally?
一根电线，剪去全长的(1/3)多3米后，余下的还有15米，这根电线原来有几米？
<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 / (2/3)</gadget>
<output>27</output>

<result>27</result>