A tourist group goes to a restaurant for dinner. If each person charges 16 yuan, there is still a difference of 4 yuan to pay for the meal. If you charge 19 yuan per person, after paying the meal fee plus 15% of the travel snack fee, there is 2 yuan left. So, how many people are there in this tour group?
一个旅游团到某饭店用餐．如果每人收16元，付用餐费还差4元．如果每人收19元，付用餐费加15%的旅途点心费后，还剩2元．那么，这个旅行团共有多少人．
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">19 * (3/20)</gadget>
<output>57/20 = around 2.85</output>

<gadget id="calculator">19 - (57/20)</gadget>
<output>323/20 = around 16.15</output>

<gadget id="calculator">(323/20) - 16</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">6 / (3/20)</gadget>
<output>40</output>

<result>40</result>