All the teachers and students of Guangming Primary School participated in the tree planting activity, planning to plant 260 trees throughout the day. If the planned (3/5) is completed in the morning, the planned (3/5) will also be completed in the afternoon. How many trees did they plant in total? Has the tree planting task been completed?
光明小学全体师生参加植树活动，计划全天植树260棵．如果上午完成计划的(3/5)，下午也完成计划的(3/5)．他们一共植树多少棵？是否完成了植树任务？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) + (3/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">260 * (6/5)</gadget>
<output>312</output>

<result>312</result>