If it takes 10 days to build a road, how many days will it take to build the full length (4/5) of the road?
修一条路10天可以完工，修这条路全长的(4/5)要用多少天．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(4/5) / (1/10)</gadget>
<output>8</output>

<result>8</result>