Li Yin plans to finish reading "The World of Fairy Tales" in 15 days. He reads 2 pages more than Wang Xing every day, so Wang Xing needs 3 more days to finish reading than Li Yin. How many pages are there in the book "Fairy Tale World"?
李寅同学计划15天看完一本《童话世界》，他每天比王星同学多看2页，所以王星同学比李寅要多3天看完．《童话世界》这本书共有多少页．
<gadget id="calculator">2 * 15</gadget>
<output>30</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">30 + 6</gadget>
<output>36</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 15</gadget>
<output>1</output>

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

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

<gadget id="calculator">1 + (-4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">36 / (1/5)</gadget>
<output>180</output>

<result>180</result>