Xinxing Machine Factory assembles 50 machines on the first day, and 6 more machines on the second day than on the first day. The number of machines assembled on the third and fourth days is twice that of the first day, and 7 machines are assembled. How many machines are assembled per day on average? tower?
新兴机器厂装配机器，第一天装配50台，第二天比第一天多装配6台，第三，四两天装配的台数都是第一天的2倍多7台，平均每天装配多少台？
<gadget id="calculator">50 + 6</gadget>
<output>56</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 + 7</gadget>
<output>107</output>

<gadget id="calculator">107 * 2</gadget>
<output>214</output>

<gadget id="calculator">50 + 56 + 214</gadget>
<output>320</output>

<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<result>80</result>