Xiaolan reads an 86-page story book. She reads 21 pages on the first day and 48 pages on the second day. How many more pages did she read on the second day than on the first day?
小兰看一本86页的故事书，第一天看到21页，第二天看到48页，第二天比第一天多看了多少页？
<gadget id="calculator">48 - 21</gadget>
<output>27</output>

<result>27</result>