Obediently read a 150-page composition book, read 25 pages on the first day, and read three times as much as the first day on the second day, how many pages are left?
乖乖看一本150页的作文书，第一天看了25页，第二天看了第一天的3倍，还有多少页没有看？
<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">150 - 25 - 75</gadget>
<output>50</output>

<result>50</result>