A wire uses 1/5 of its total length to be 3 meters less, and there are 27 meters left. How long is this wire originally?
一根电线，用去全长的(1/5)少3米，还剩下27米，这根电线原来长多少米？
<gadget id="calculator">27 - 3</gadget>
<output>24</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">24 / (4/5)</gadget>
<output>30</output>

<result>30</result>