It takes Xiao Ming 23 days to read a storybook. Read 18 pages a day for the first 5 days, and 15 pages a day for the next 18 days. How many pages does this storybook have? (answer in a simple way)
一本故事书小明要23天才能看完．前5天每天看18页，后18天每天看15页．这本故事书共有多少页？(用简便方法解答)
<gadget id="calculator">5 * 18</gadget>
<output>90</output>

<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">90 + 270</gadget>
<output>360</output>

<result>360</result>