Xiao Ming reads a storybook, and reads the whole book (1/15) every day. After 3 days, there are 240 pages left to read. How many pages does this storybook have?
小明读一本故事书，每天读全书的(1/15)，3天后还剩240页没有读，这本故事书书一共有多少页？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">240 / (4/5)</gadget>
<output>300</output>

<result>300</result>