Zhang Hua read a storybook. He read (1/3) of the whole book on the first day and 40% of the whole book on the second day. He read 30 pages less on the first day than on the second day. How many pages does this storybook have? ?
张华读一本故事书，第一天读了全书的(1/3)，第二天读了全书的40%，第一天比第二天少读30页，这本故事书共有多少页？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">30 / (1/15)</gadget>
<output>450</output>

<result>450</result>