There are 90 picture books in the school library. It is known that the number of picture books is (3/4) of science books, and the number of story books is (1/3) of science books. How many story books are there?
学校图书室里有连环画册90本，已知连环画册的本数是科技书的(3/4)，故事书的本数是科技书的(1/3)．故事书有多少本？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 / (3/4)</gadget>
<output>120</output>

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

<gadget id="calculator">120 * (1/3)</gadget>
<output>40</output>

<result>40</result>