and B plant trees. It takes more time (1/3) to plant this batch of trees than B alone. If two people work together, B will plant 36 more trees than A when the task is completed. How many trees are there in total?
甲、乙二人植树．单独植完这批树甲比乙需要的时间多(1/3)，如果二人一起干，完成任务时乙比甲多植36棵，这批树一共多少棵？
<gadget id="calculator">3 / 1</gadget>
<output>3</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">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">36 / (1/7)</gadget>
<output>252</output>

<result>252</result>