There are 350 popular science books and story books in the school library, and the ratio of popular science books to story books is (4/3). How many popular science books are there?
学校图书馆的科普读物和故事书共350本，科普读物与故事书的比是(4/3)．科普读物有多少本？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">350 * (4/7)</gadget>
<output>200</output>

<result>200</result>