3 teams planted trees, the first team planted 30% of the total number of trees, the ratio of the number of trees planted by the second team to the third team was 2:5, the third team had 18 more trees than the second team, 3 How many trees did the team plant in total?
3个小队种树，第一小队种了总棵数的30%，第二小队和第三小队种树的棵数比是2：5，第三小队比第二小队多种了18棵，3个小队共种了多少棵树．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(5/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(7/10) * (3/7)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">18 / (3/10)</gadget>
<output>60</output>

<result>60</result>