An umbrella factory produced 20% of the total number of tents on the first day and 7/20 of the total number of tents on the second day in order to support the rush production of a batch of tents in the dry area of Southwest China. A total of 2,200 tents were produced in two days. How many tents are there in total?
某伞厂为支援西南旱区赶产一批帐篷，第一天生产了总帐篷数的20%，第二天生产了总帐篷数的(7/20)，两天共生产帐篷2200顶．这批帐篷一共有多少顶？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(1/5) + (7/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">2_200 / (11/20)</gadget>
<output>4_000</output>

<result>4_000</result>