When reading a book, the ratio of those who have read to those who have not read is 1:2. If you read another 50 pages, you have already read (3/4) of the whole book. How many pages are there in total?
看一本书，已看与未看的比是1：2，如果再看50页，已看了全书的(3/4)，全书共多少页？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">50 / (5/12)</gadget>
<output>120</output>

<result>120</result>