In the "Reading Education Action Plan" activity, Chengnan Primary School held a popular science knowledge quiz. Wang Qing has answered 16 questions correctly and 2 questions incorrectly. If she wants to achieve a 90% correct answer rate, at least How many questions to answer correctly in a row.
在开展"读书教育行动计划"活动中，城南小学举行了一次科普知识抢答赛，王晴同学已经答对了16题，答错了2题，她要想使自己的答题正确率达到90%，至少要连续答对多少题．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / (1/10)</gadget>
<output>20</output>

<gadget id="calculator">20 - 16 - 2</gadget>
<output>2</output>

<result>2</result>