Xiaofang finished reading a storybook in three weeks, the whole book in the first and third weeks (3/4), the whole book in the second and third weeks (5/7), and the whole book in the second week. What percentage?
小芳用三周时间看完了一本故事书，第一、三周看了全书的(3/4)，第二、三周看了全书的(5/7)，第二周看了全书的几分之几？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>