Xiao Li has 20 extracurricular children's books, which is 10% less than Xiao Hong's. How many children's books does Xiao Hong have? What is the correct column
小李有20本课外儿童读物，比小红少10%，小红有多少本儿童读物？正确列式是多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">20 / (9/10)</gadget>
<output>200/9 = around 22.222222</output>

<result>200/9 = around 22.222222</result>