Li Yu reads a storybook and reads 25 pages a day. After 4 days, he still has 18 pages to read. How many pages does this storybook have?
李玉看一本故事书，每天看25页，4天后还有18页没有看完，这本故事书一共有多少页？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 + 18</gadget>
<output>118</output>

<result>118</result>