Xiao Yu has read a book, the ratio of the number of pages he has read to the number of pages he has not read is 5:7, how much of the whole book has he read (fill in the score)
小雨看了一本书，已看的页数和未看的页数比为5：7，他看了全书的多少(填分数)
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>