Xiaoli reads a book and reads 45 pages in 3 days. According to this calculation, she reads it in 4 days. How many pages does the book have?
小丽看一本书，3天看了45页，照这样计算，又看了4天看完，这本书一共有多少页？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<result>105</result>