Teacher Wang brought a batch of school aids and distributed them to the whole class. For those who have already allocated this batch of school aids (5/6), there are still 20 left. How many pieces are there in this batch?
王老师拿来一批学具分给全班同学，已经分了这批学具的(5/6)，还剩20个．这批学具共有多少个？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

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

<result>120</result>