Xiaoliang read a storybook in three days, 60 pages on the first day, 40% of the book on the second day, and 1/5 of the whole book on the third day. How many pages are there in this book?
一本故事书小亮三天看完，第一天看了60页，第二天看了全书的40%，第三天看了全书的(1/5)．这本书一共多少页？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 / (2/5)</gadget>
<output>150</output>

<result>150</result>