A 480-page book, 60% read, how many pages are left?
一本480页的书，看了60%，还剩多少页？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">480 * (2/5)</gadget>
<output>192</output>

<result>192</result>