Xiaoliang reads a science and technology book. He reads 20% of the whole book on the first day. I didn't read (1/6) of the whole book. How many pages does this book have?
小亮看一本科技书，第一天看了全书的20%，第二天看的与第一天看的页数比是3：2，第三天看了40页，这时还剩下全书的(1/6)没看．这本书共有多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/5) - (3/10) - (1/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">40 / (1/3)</gadget>
<output>120</output>

<result>120</result>