Xiaofang reads a storybook, 15 pages a day, which can be finished in 12 days. If you read 18 pages a day, how many days can you finish it? (column equation solution)
小芳读一本故事书，每天读15页，12天可以读完．如果每天读18页，几天可以读完？(列方程解答)
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">180 / 18</gadget>
<output>10</output>

<result>10</result>