Xiao Ming reads a book and reads 15 pages on the first day, 3 pages less than the second day. How many pages did he read on the second day?
小明看一本书，第一天看了15页，比第二天少看3页，第二天看了多少页？
<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<result>18</result>