The number of science and technology books is (5/9) the number of story books, so how much more are the number of story books than the number of science and technology books?
科技书的本数是故事书本数的(5/9)，那么故事书的本数比科技书的本数多多少．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) / (5/9)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>