It took Xiaoqiang 12 days to read a storybook. I read 90 pages in the first 5 days, and 20 pages a day in the next 7 days. How many pages does this book have?
一本故事书小强用了12天看完．前5天看了90页，后7天每天看20页．这本书一共有多少页？
<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">90 + 140</gadget>
<output>230</output>

<result>230</result>