The school has 36 story books, which are science books (4/9). How many science books are there?
学校有故事书36本，是科技书的(4/9)，科技书有多少本？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">36 / (4/9)</gadget>
<output>81</output>

<result>81</result>