A book has 360 pages. I read (1/4) on the first day and the rest (2/3) on the second day. How many pages are left?
一本书360页，第一天看了(1/4)，第二天看了余下的(2/3)，还有多少页没看完？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">360 * (1/4)</gadget>
<output>90</output>

<gadget id="calculator">360 - 90</gadget>
<output>270</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">270 * (1/3)</gadget>
<output>90</output>

<result>90</result>