A story book has 120 pages, Xiaohong has read (3/4) of it, how many pages are left?
一本故事书120页，小红读了它的(3/4)，还剩多少页？
<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>

<gadget id="calculator">120 * (1/4)</gadget>
<output>30</output>

<result>30</result>