Xiao Zhang wants to organize some friends to travel abroad during the National Day holiday. The charging standard for travel agencies is: less than 20 people, including 20 people. Basic fee 18000 yuan.
Suppose you need to recruit 20+N people to travel,
According to the meaning of the question, there are: (20+N) * 700 =18000+400 * N;
Namely: 300n = 4000；;
n = 13.3；
A: At least 20+ 13.3=34 people need to be recruited.