Xiao Ming read a story book, and read 60 pages in 3 days. According to this calculation, after another 4 days of reading, how many pages have been read? (Solve with ratio)
小明读一本故事书，3天读了60页．照这样计算，又读了4天，又读了多少页？(用比例解)
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>