The length of a piece of wood is equal to (4/5) plus (4/5) meters of this piece of wood. How many meters is this piece of wood?
一根木料的长度等于这根木料的(4/5)加上(4/5)米，这根木料长多少米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

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

<result>4</result>