Xiaogang has a 150-page story book. He read the whole book (1/5) on the first day and the remaining 40% on the second day. How many pages are left?
小刚有一本150页的故事书，第一天看了全书的(1/5)，第二天看了剩下的40%，还剩下多少页没有看？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<gadget id="calculator">150 - 30</gadget>
<output>120</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 * (3/5)</gadget>
<output>72</output>

<result>72</result>