Classes A, B, and C of the sixth grade plant trees. The task assignment is: Class A should plant 40% of the total number of trees in the three classes, and the ratio of the number of trees planted in classes B and C is 4:3. When class A planted 200 trees, it just completed (2/7) of the total number of trees planted by the three classes. Ask Class C to plant how many trees?
六年级甲、乙、丙三个班植树，任务分配是：甲班要植三个班总棵数的40%，乙、丙两班植树棵数的比是4：3．当甲班植了200棵树时，正好完成三个班植树总棵数的(2/7)．求丙班植树多少棵？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">200 / (2/7)</gadget>
<output>700</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

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

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

<gadget id="calculator">700 * (3/5) * (3/7)</gadget>
<output>180</output>

<result>180</result>