A book has 360 pages. I read the whole book (2/9) on the first day and the rest (3/7) on the second day. How many pages are left?
一本书360页，第一天看了全书的(2/9)，第二天看了余下的(3/7)，还剩下多少页？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">360 * (7/9) * (4/7)</gadget>
<output>160</output>

<result>160</result>