The students planted a total of 120 trees, which survived (19/20), how many trees did not survive.
同学们一共植树120棵，成活了(19/20)，有多少棵没成活．
<gadget id="calculator">19 / 20</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">120 * (1/20)</gadget>
<output>6</output>

<result>6</result>