A Sino-foreign joint venture undertook a batch of production according to the requirements of the foreign businessman. It was originally planned to be completed in 13 days. After the scientific and technical personnel adopted a new high-tech, they were able to produce 10 more units per day. As a result, they not only completed the task in 12 days, but also exceeded the quota by 60 units. , How many machines did you originally plan to undertake?
某中外合资企业，按照外商要求承做一批及其，原计划13天完成，科技人员采用一种高新技术后，每天能够多生产10台，结果12天不但完成了任务，而且超额了60台，原计划承做多少台机器？
<gadget id="calculator">10 * 12</gadget>
<output>120</output>

<gadget id="calculator">120 - 60</gadget>
<output>60</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">(1/13) * 12</gadget>
<output>12/13 = around 0.923077</output>

<gadget id="calculator">1 - (12/13)</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">60 / (1/13)</gadget>
<output>780</output>

<result>780</result>