Xiaolan reads a book. She reads (1/6) of the whole book on the first day and (1/5) of the whole book on the second day, which happens to be 66 pages. How many pages did you read on the first day?
小兰看一本书，第一天看了全书的(1/6)，第二天看了全书的(1/5)，正好是66页．第一天看了多少页？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) + (1/5)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">66 / (11/30)</gadget>
<output>180</output>

<gadget id="calculator">180 * (1/6)</gadget>
<output>30</output>

<result>30</result>