A book has 600 pages. Xiao Hua read it on the first day (7/15) and the second day (13/30). Which day do you see more? How many more pages?
一本书有600页，小花第一天看了(7/15)，第二天看了(13/30)．哪一天看得多？多多少页？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">600 * (7/15)</gadget>
<output>280</output>

<gadget id="calculator">13 / 30</gadget>
<output>13/30 = around 0.433333</output>

<gadget id="calculator">600 * (13/30)</gadget>
<output>260</output>

<gadget id="calculator">280 - 260</gadget>
<output>20</output>

<result>20</result>