The school organizes seventh-grade students to travel. The following are the details of Xiaoying and Xiaorong going to the bus company:

Suppose x cars are rented and the seventh grade student is n, then

45X+5=N

60X-70=N

Meanwhile: x=5, n=230.

In other words, if you want to rent five 45-seat cars and five people have no seats, you must rent six cars, so the cost is: 6*250= 1500 yuan.

As for a car with 60 seats, only four cars are needed, and the cost is 4 * 300 = 1200 yuan.

It can be seen that renting a 60-seat car is more cost-effective!