Xiao Li borrowed a story book. She read 60 pages in 3 days. At this rate, she can read it in a week. How many pages does the book have?
小丽借了一本故事书，她3天看吧60页，照这样的速度，一个星期她就能看完，这本书一共有多少页？
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<result>140</result>