A story book, Liangliang has already read (6/8) of the whole book, what fraction of the whole book is left behind?
一本故事书，亮亮已经读了全书的(6/8)，剩下的比读了的少全书的几分之几？
<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>