Friendship Umbrella Factory produced a batch of tents to support the disaster area. It produced 20% of the total number of tents on the first day and 7/20 of the total number on the second day. A total of 3,300 tents were produced in two days. How many tops are there?
友谊伞厂为支援灾区赶制一批帐篷，第一天生产了这批帐篷总数的20%，第二天生产了总数的(7/20)，两天共生产帐篷3300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">3_300 / (11/20)</gadget>
<output>6_000</output>

<result>6_000</result>