A, B, and C jointly produce a batch of parts. The parts produced by A are the sum of B and C (1/2). The ratio of the sum of parts produced by A and C to the number of parts produced by B is 7:2. The parts produced by C 60 more than A, how many parts A produced.
甲乙丙三人共同生产一批零件，甲生产的零件是乙丙总和的(1/2)，甲丙生产的零件的总和与乙生产的零件个数的比是7：2，丙生产的零件比甲多60个，甲生产了多少个零件．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (1/3) - (2/9) - (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">60 / (1/9)</gadget>
<output>540</output>

<gadget id="calculator">540 * (1/3)</gadget>
<output>180</output>

<result>180</result>