Xiao Ming reads a 150-page story book. After a few days of reading, there are still (2/5) of this book left. How many pages has Xiao Ming read?
小明读一本150页的故事书，读了几天后还剩下这本书的(2/5)，小明已经读了多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<result>90</result>