In a challenge activity organized by a school, at the end of the first round of challenges, the number of people who did not pass the level was 1/6 of the number of people who passed the level. After the second round of challenges, one more person passed the level. (1/7), how many people participated in this challenge?
在一次学校组织的挑战活动中，第一轮挑战结束时，不过关人数是过关人数的(1/6)，经过第二轮挑战，又有1人过关，这时，不过关人数是过关人数的(1/7)，问参加这次挑战活动的共几人？
<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(7/8) - (6/7)</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">1 / (1/56)</gadget>
<output>56</output>

<result>56</result>