In a book, the ratio of the number of pages read to the number of pages not read is 5:9. What is the percentage of the number of pages read to the total number of pages?
一本书，看了的页数与没看的页数比是5：9，看了的页数占总页数的多少．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">5 / 14</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>