If you read 80 pages of a 200-page book, what percentage of the book do you read?
一本200页的书，读了80页，读了这本书的百分之几？
<gadget id="calculator">80 / 200</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>