There are 450 comic books in the school library. The number of story books is comic books (4/5) and science books (1/5). How many science books are there in the library?
学校图书室有连环画450本．故事书的本数是连环画的(4/5)，又是科技书的(1/5)，图书室有科技书多少本？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) / (1/5)</gadget>
<output>4</output>

<gadget id="calculator">450 * 4</gadget>
<output>1_800</output>

<result>1_800</result>