The school organizes fifth and sixth graders to participate in tree planting, and plans to distribute the tree planting tasks to fifth and sixth graders on a 3:4 basis. The fifth grade actually planted 140 trees, and the sixth grade completed this batch of tree planting tasks (2/3), how many trees were originally planned to be planted in the sixth grade?
学校组织五六年级学生参加植树，计划把植树任务按3：4分配给五、六年级．实际五年级植树140棵，六年级完成这批植树任务的(2/3)，原计划六年级植树多少棵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">140 / (1/3)</gadget>
<output>420</output>

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

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">420 * (4/7)</gadget>
<output>240</output>

<result>240</result>