Xiaohong reads a book. On the first day, she reads (1/8) of the whole book, and on the second day, she reads the rest (2/21). How much did you watch on the second day compared to what you watched on the first day?
小红看一本书，第一天看了全书的(1/8)，第二天看来余下的(2/21)．第二天看的是第一天看的几分之几？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">2 / 21</gadget>
<output>2/21 = around 0.095238</output>

<gadget id="calculator">(2/21) / (1/8)</gadget>
<output>16/21 = around 0.761905</output>

<gadget id="calculator">(7/8) * (16/21)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>