There are 200 story books, there are more science books than story books (1/4), how many science books are there?
故事书200本，科技书比故事书多(1/4)，科技书有多少本．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">200 * (5/4)</gadget>
<output>250</output>

<result>250</result>