Jinxin Real Estate Company plans to build a new residential complex with 35 million yuan. (2/7) of the planned amount is used for the first phase of the project, and (1/2) of the planned amount is used for the second phase of the project. Do you know how many ten thousand yuan was spent on these two phases of the project?
金鑫房地产公司计划用3500万元新建一个住宅小区．一期工程用去计划金额的(2/7)，二期工程用去计划金额的(1/2)．你知道这两期工程一共用去了多少万元吗？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/7) + (1/2)</gadget>
<output>11/14 = around 0.785714</output>

<gadget id="calculator">3_500 * (11/14)</gadget>
<output>2_750</output>

<result>2_750</result>