There are 3 willow trees, 4 poplar trees and 5 sycamore trees beside the road. The sycamore trees account for the total ((())/(())).
路旁有3棵柳树，4棵杨树，5棵梧桐树，梧桐树占总数的((())/(()))．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

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

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