There are 54 questions in a math practice paper. Li Ming is working on them in order. The completed questions are 20% less than the unfinished ones. What Li Ming will do next is the number one question.
一份数学练习卷共有54道题，李明按顺序在做，已做完的题目比没做完的题目少20%，李明接下来要做的是第多少道题．
<gadget id="calculator">20 / 100</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">(4/5) + 1</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">54 / (9/5)</gadget>
<output>30</output>

<gadget id="calculator">54 - 30</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>