200-page story book "The Adventures of Little Bear", Cai Wei plans to read it in 20 days. So how much did he read this book in 9 days?
一本200页的故事书《小熊历险记》，蔡伟计划20天看完．那么他9天看了这本书的多少
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 9</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>