Xiao Ming read (2/3) of the total number of pages in an extra-curricular book yesterday, and today he read another 15 pages, just reaching (3/4) of the total number of pages. At today's pace, it will take a few days to finish reading this book.
小明昨天读到一本课外书总页数的(2/3)处，今天又读了15页，刚好达到总页数的(3/4)．按照今天的速度，还需要几天才能读完这本书．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) - (2/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">15 / (1/12)</gadget>
<output>180</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 15</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">180 * (1/60)</gadget>
<output>3</output>

<result>3</result>