A book has a total of 600 pages. Xiaoxin read 30% of the whole book on the first day and (1/2) of the whole book on the second day. How many pages are left?
一本书共600页，小新第一天看了全书的30%，第二天看了全书的(1/2)，还剩多少页没有看？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/10) + (1/2)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">600 * (4/5)</gadget>
<output>480</output>

<gadget id="calculator">600 - 480</gadget>
<output>120</output>

<result>120</result>