In the sixth grade of the school, 30 students participated in the Mathematics Olympiad interest group, which was less than the number of students in English Cambridge (2/7). How many people are there in the English Cambridge group? (column equation solution)
学校六年级有30人参加奥数兴趣小组，比英语剑桥的人数少(2/7)．英语剑桥小组有多少人？(列方程解答)
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">30 / (5/7)</gadget>
<output>42</output>

<result>42</result>