Xiao Ming reads a story book, reads 20 pages a day, and can finish it in 8 days. If you read 16 pages a day, how many days will it take to finish reading? (Solve with ratio)
小明看一本故事书，每天看20页，8天能看完．如果每天看16页，多少天才能看完？(用比例解)
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 / 16</gadget>
<output>10</output>

<result>10</result>