Xiao Ming read 40% of a book on the first day, the rest (1/3) on the second day, and 64 pages on the second day. How many pages does this book have?
小明第一天看了一本书的40%，第二天看了余下的(1/3)，第二天看了64页．这本书共有多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">64 / (1/3) / (3/5)</gadget>
<output>320</output>

<result>320</result>