There are 729 story books, science books (8/9) of story books, and comic books (5/6) of science books. If you buy the least one of these books, how many copies do you need to buy?
故事书有729本，科技书的本数是故事书的(8/9)，漫画书是科技书的(5/6)．如果买其中最少的一种书，需要买多少本？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">729 * (8/9) * (5/6)</gadget>
<output>540</output>

<result>540</result>