To read a book, you have read (1/6) of the total pages. If you read another 30 pages, the ratio of read to unread is 3:5. How many pages does this book have?
读一本书，已读了总页数的(1/6)，如果再读30页，则已读的和未读的比是3：5，这本书共有多少页？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">(3/8) - (1/6)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">30 / (5/24)</gadget>
<output>144</output>

<result>144</result>