The number of teachers in the first batch of learning is 2 less than 40% of the total number of people, and there are 16 people in the second batch. The ratio of the number of remaining people to the number of people who have learned is 1:3. How many teachers are there to participate in the learning?
第一批学习的教师比总人数的40%少2人，第二批有16人，剩下的人数与已学的人数之比是1：3，参加学习的教师有多少人？
<gadget id="calculator">16 - 2</gadget>
<output>14</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">14 / (7/20)</gadget>
<output>40</output>

<gadget id="calculator">40 * (3/4)</gadget>
<output>30</output>

<result>30</result>