Xiaohua reads a book and has already read (2/5), and there are 60 pages left. How many pages has Xiaohua read?
小华看一本书，已看了(2/5)，还剩60页没看，小华已经看了多少页？
<gadget id="calculator">2 / 5</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">60 / (3/5)</gadget>
<output>100</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<result>40</result>