A group of workers went to two construction sites, A and B, to clean up. The workload of construction site A was 1 (1/2) times that of construction site B. The number of people going to construction site A in the morning is three times that of those going to construction site B. In the afternoon, (7/12) of the workers in this group go to construction site A, and the rest go to construction site B. In the evening, the work at construction site A has been completed, and the work at construction site B still needs 4 workers to do it for another day, so how many workers are there in this group?
一批工人到甲、乙两个工地进行清理工作，甲工地的工作量是乙工地的工作量的1(1/2)倍．上午去甲工地的人数是去乙工地人数的3倍，下午这批工人中有(7/12)的人去甲工地，其他工人去乙工地．到傍晚时，甲工地的工作已做完，乙工地的工作还需4名工人再做1天，那么这批工人有多少人？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(3/4) + (7/12)</gadget>
<output>4/3 = around 1.333333</output>

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

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(1/2) / (3/2)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/3) * (1/3)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(1/4) + (5/12)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * (1/2)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) - (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / (1/9)</gadget>
<output>36</output>

<result>36</result>