Zhang Xin reads a 120-page popular science book, reads 30% of the whole book on the first day, and reads (2/5) of the whole book on the second day, how many pages are left?
张新看一本120页的科普书，第一天看了全书的30%，第二天看了全书的(2/5)，还剩下多少页？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (3/10) - (2/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">120 * (3/10)</gadget>
<output>36</output>

<result>36</result>