Jiang Tao finished reading a storybook in 3 days. He read (1/3) of the book on the first day, the remaining 40% on the second day, and finished it on the third day. If you read 10 pages less on the second day than on the first day, how many pages are there in this book?
江涛用3天时间读完1本故事书，第一天读了这本书的(1/3)，第二天读了余下的40%，第三天读完．如果第二天比第一天少读了10页，问这本书共有几页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) * (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(1/3) - (4/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">10 / (1/15)</gadget>
<output>150</output>

<result>150</result>