There are 140 willow trees, the number of willow trees is metasequoia (7/9), the number of metasequoia is sycamore (12/15), how many sycamore trees are there?
柳树有140棵，柳树的棵数是水杉的(7/9)，水杉的棵数是梧桐树的(12/15)，梧桐树有多少棵？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">12 / 15</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">140 / (7/9) / (4/5)</gadget>
<output>225</output>

<result>225</result>