There are three kinds of trees in the campus. It is known that there are 80 poplars, accounting for 2/9 of the total number of trees. The ratio of pine trees to willows is 3:4. How many pine trees are there on campus?
校园里有三种树，已知杨树有80棵，占总棵数的(2/9)，松树与柳树的棵数比为3：4．校园里有松树多少棵？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">80 / (2/9)</gadget>
<output>360</output>

<gadget id="calculator">360 - 80</gadget>
<output>280</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">280 * (3/7)</gadget>
<output>120</output>

<result>120</result>